- Table of Contents
- Intro
- Our Verdict
- Test Results
- Differences
- Compared To Others
- Deals
- Discussions
The Logitech G305 LIGHTSPEED is a wireless gaming mouse with a solid, plastic shell. It connects using a USB receiver and uses a single AA battery for power. Its egg-shaped body is nearly symmetrical, and there's a pair of side buttons on the left and a button behind the scroll wheel that acts as a CPI button by default. This mouse is a bit on the smaller side and may not be well-suited for people with very large hands, but it feels as well-built and premium as some of Logitech's higher-end mice. Performance-wise, it has low click latency and a very low minimum lift-off distance. You can also adjust the CPI by precise increments within a broad range.
Our Verdict
While the Logitech G305 is designed as a gaming mouse, it's good for office use. It feels very well-built and solid, but it's somewhat heavy for its size. It has two side buttons, and all of its buttons are programmable using the customization software compatible with Windows and macOS. However, those with larger hands may find it very comfortable, depending on grip type. Additionally, the scroll wheel lacks both L/R tilt buttons and a free-scrolling function.
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Feels very well-built.
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Tons of customization options using the companion software for Windows or macOS.
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Connects wirelessly with its USB receiver.
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Might be a bit too small for people with larger hands.
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Scroll wheel lacks L/R tilt buttons and a free-scrolling mode.
The Logitech G305 LIGHTSPEED is a good mouse for FPS gaming. It has low click latency and should be comfortable enough for most users during long gaming sessions. All its six buttons are programmable, and its sensor performance is excellent. Due to its small size, it isn't an ideal choice for larger hands. Also, it's heavy compared to many gaming mice on the market, and aside from custom modifications, there aren't any weight optimization options.
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Feels very well-built.
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Low click latency.
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Heavy.
The Logitech G305 is a decent mouse for MMO gaming. While it doesn't have as many side buttons as dedicated MMO mice, all its buttons are programmable, including the CPI button behind the scroll wheel. It also has low click latency and great sensor performance, with many customization options within Logitech's G HUB software. Unfortunately, it's a bit on the smaller side, and those with larger hands will likely only be comfortable using a claw or fingertip grip.
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Feels very well-built.
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Low click latency.
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Tons of customization options using the companion software for Windows or macOS.
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Might be a bit too small for people with larger hands.
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Heavy.
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Not nearly as many side buttons as a dedicated MMO mouse.
The Logitech G305 is only okay for ultra-light gaming. It's heavy for its size, and there are no weight optimization options. That said, it has low click latency and feels very comfortable for all grip types and most hand sizes.
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Feels very well-built.
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Low click latency.
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Might be a bit too small for people with larger hands.
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Heavy.
The Logitech G305 is a very good mouse for travel. It's small, doesn't have a wire, and the USB receiver can be stored under the mouse's back panel, so you won't lose it when you toss it in your bag. It shouldn't be too bothersome in tight spaces like on a plane, and it needs a single AA battery for power, so you can quickly swap in a new one when it dies. Unfortunately, it may be too small for those with very large hands unless you use the fingertip grip.
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Feels very well-built.
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Connects wirelessly with its USB receiver.
- 7.6 Office/Multimedia
- 7.6 Video Games (FPS)
- 7.1 Video Games (MMO)
- 6.9 Ultra-Light Gaming
- 7.8 Travel
- Updated Nov 05, 2021: We've rescanned the mouse and uploaded a new scan with the mouse properly positioned.
- Updated Oct 07, 2020: Fixed an error with the number of programmable inputs.
- Updated Oct 05, 2020: Changed dimension measurements from cm to mm.
- Updated Oct 05, 2020: Converted to Test Bench 1.0.
- Updated Dec 20, 2019: Converted to Test Bench 0.8.1.
- Updated Dec 11, 2019: Review published.
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Test Results
The Logitech G305 has a classic look and a rather small, egg-shaped body. It's available in matte black, white, lilac, or blue. It has no RGB zones and only has a small Logitech G logo on the back. For a similar Logitech mouse with a more diamond-like shape, check out the Logitech G303 Shroud Edition.
Update 11/05/2021: Our original 3D model scan was slightly tilted. We've rescanned the Logitech G305 LIGHTSPEED, ensured it's properly positioned, and uploaded the properly aligned scan.
Thanks to its small footprint and wireless capabilities, the Logitech G 305 is portable. You can also store its USB receiver under the palm rest panel, making it easy to throw into a bag. If you're looking for a more office-oriented, cheap wireless mouse, check out the Logitech M510.
The Logitech G305 is somewhat heavy for its size, with most of its weight distributed to the back, and there are no weight optimization options. For something lighter, check out the Finalmouse Ultralight 2 - Cape Town or the Cooler Master MM710.
This mouse's build quality is great. It's made of solid plastic and has no loose or wobbly parts. It feels almost as premium as some much more expensive options from Logitech, like the Logitech G Pro Wireless. However, the palm rest panel covering the battery and receiver storage area feels slightly more flexible than the other outer surfaces, but this is to be expected as it's removable. That said, it doesn't affect the performance of the mouse during normal use.
The Logitech G305 wireless is very comfortable. Even though this mouse has a slight curve and its side buttons are on the left side, it's still fairly ambidextrous and should work well for both left and right-handed people. Due to its small design, it's best suited for smaller hands, though it should also suit any hand size using a fingertip grip. If you prefer a wireless mouse with a right-slanted design, check out the Logitech G403 Wireless.
Due to its small size, the Logitech G305 works best with palm grip for people with small or medium-sized hands. Larger hands may find it uncomfortable, as their pinky will rest awkwardly on the side.
The Logitech G305 should work well in a claw grip for everyone except those with extra-large hands, who may find it too small and uncomfortable.
The Logitech G305 is great for fingertip grip as any hand size should be able to use it comfortably and easily reach all the buttons.
The Logitech G305 is a wireless mouse that connects wirelessly with its USB receiver and has a USB wireless extender cable included. It requires a single AA battery, which Logitech claims lasts up to 250 hours of use. The indicator for the CPI switch also indicates when your battery is running low. If you'd like a mouse with Bluetooth support, check out the Corsair KATAR PRO Wireless or the Razer Orochi V2. Or, for a mouse that supports Bluetooth and wireless charging with any Qi-standard charging device, check out the HyperX Pulsefire Dart.
This is a wireless mouse, and you can't use it wired. The included cable is only an extension for the wireless receiver.
The feet glide well on mousepads, but they feel a little rough and loud when used directly on desks. On the plus side, there are third-party feet available that may solve these issues for some users.
- Logitech G305 mouse
- AA battery
- USB wireless receiver
- USB wireless extender cable
- Manuals
- Sticker
You have the choice between four polling rates: 125Hz, 250Hz, 500Hz, and 1000Hz, and the sensor is very consistent whether you move the cursor quickly or slowly. Also, the lift-off distance is low enough that the sensor shouldn’t track your movement when you're repositioning your mouse.
The Logitech G305 has a decent amount of buttons, including two side buttons and a dedicated CPI button behind the scroll wheel. All the buttons are programmable, including the left click. You can also set a G-Shift button that enables another layer of commands for as long as you press it. Strangely, you can set a button as a profile switch, but the onboard memory only supports a single profile, so the button doesn't do anything.
The Logitech G305 has a standard incremented mouse wheel. Unlike the Logitech G502 HERO or the more office-oriented Logitech MX Master 2S, you can't unlock it for free-scrolling.
The mouse clicks are loud, although it shouldn't disturb people around you unless you're in a very noise-sensitive environment.
The Logitech G305 has an impressive click latency for a wireless mouse, and even more competitive gamers shouldn't notice any input lag.
The customization software offers a wide variety of adjustments and options. Unfortunately, while the mouse has onboard memory, you can only save one profile to the mouse itself at a time. You can create and save other profiles, but you need to open the software to cycle between them.
Differences Between Sizes And Variants
While we tested the white version, the Logitech G305 LIGHTSPEED is also available in black, lilac, and blue. There's also a variant that's part of a League of Legends collaboration lineup, with K/DA coloring. Outside of North America, this mouse is sometimes called the Logitech G304 LIGHTSYNC. As we understand it, the only difference is in name, and we expect our test results to remain applicable for this alternatively named variant.
Compared To Other Mice
The Logitech G305 LIGHTSPEED is a good gaming and office mouse with a very consistent, high-performing sensor and a distinctive, egg-shaped body suitable for left or right-handed users. Its customization software is also compatible with both Windows and macOS. Additionally, this mouse is a popular choice for enthusiasts who like to make modifications to their peripherals.
For other options, take a look at our recommendations for the best mice, the best gaming mice, and the best wireless mice. If you're interested in other Logitech products, be sure to check out our picks for the best Logitech mice.
The Logitech G305 LIGHTSPEED and the Razer Basilisk X Hyperspeed are both good wireless gaming mice. The Logitech has an ambidextrous design and a slightly smaller body that’s more suitable for small and medium hands. If you’re planning to use your mouse with a different OS, it could be a better option since it’s fully compatible with both Windows and macOS. Its sensor is also more consistent, and it has a lower lift-off distance. On the other hand, the Razer has a wider CPI range and more programmable inputs with the option to set a Hypershift button. Shape-wise, the Razer should fit more hand sizes with any grip type.
The Logitech G305 LIGHTSPEED and the Razer Orochi V2 are good wireless gaming mice with strengths in different areas. The Razer is significantly lighter, connects wirelessly with its USB receiver or via Bluetooth, and uses either an AA or AAA battery. It's well-suited for fingertip grip, but only for large and medium-sized hands. Comparatively, the Logitech only connects wirelessly with a USB receiver, and it uses one AA battery. That said, you can adjust its CPI more precisely, and its software is compatible with Windows and macOS. It's well-suited to all hand sizes with a fingertip grip.
The Logitech G305 LIGHTSPEED and the Logitech G604 LIGHTSPEED are for different uses. The G305 is good for FPS gaming. It’s much smaller and lighter than the G604 and has an ambidextrous design that’s well-suited for a fingertip grip. The G604 is a good choice for MMOs, with six buttons on the side and a total of 29 programmable inputs. It’s heavy and wide, so people with smaller hands may struggle to reach all the buttons. Both mice are wireless-only, but the G604 supports Bluetooth, while the G305 doesn't.
The SteelSeries Rival 3 Wireless is a better gaming mouse than the Logitech G305 LIGHTSPEED. The SteelSeries feels better built, has Bluetooth support, and has an RGB lighting zone in its scroll wheel. However, the Logitech's set CPI is slightly more consistent and can be adjusted more precisely.
The Logitech G603 LIGHTSPEED is better than the Logitech G305 LIGHTSPEED. The G603 feels better built and is better suited for any hand-size with a palm grip. It also has Bluetooth support. On the other hand, the G305 is lighter and has a marginally lower click latency.
The Glorious Model O is a better ultra-light gaming mouse than the Logitech G305 LIGHTSPEED, as its honeycomb design makes it very lightweight. It also feels slightly better built and more comfortable. However, the Logitech is better for people with smaller hands. The Logitech is also a wireless mouse but has almost the same click latency as the Glorious.
The Logitech G PRO X SUPERLIGHT has better overall performance than the Logitech G305 LIGHTSPEED. Even though the G PRO is slightly bigger, it’s significantly lighter, making it an excellent choice for fans of ultra-light gaming. It also feels more comfortable overall, and it’s a great fit for most hand sizes and grip types. It has better feet, a wider CPI range, and a lower click latency. That said, the G305 is still a very good option for FPS gaming. It has a great shape for fingertip grip and offers a few more programmable inputs. However, you can only use it wirelessly.
The Razer Viper Mini is a better gaming mouse than the Logitech G305 LIGHTSPEED. The Razer is a very lightweight wired-only mouse well-suited for any hand-size using a fingertip grip. It has more programmable inputs, a much lower click latency, and better feet that glide more smoothly. That said, the Logitech's sensor is somewhat better-suited for gaming with a wider CPI range that you can adjust more precisely, a lot less CPI variation, and a lower lift-off distance. However, it’s a lot heavier, which may bother some FPS gamers. On the plus side, the Logitech is a good option for the office or while traveling due to its wireless design.
The Logitech G502 HERO is a better gaming mouse than the Logitech G305 LIGHTSPEED. It feels better built, has more programmable buttons, and you can set the CPI more precisely. Its scroll wheel also has L/R tilt buttons and a free-scrolling mode. On the other hand, the G305 can be used with any grip type by people with smaller hands and is more portable thanks to its smaller, wireless design.
The Corsair KATAR PRO Wireless and the Logitech G305 LIGHTSPEED are both good gaming mice. The Logitech feels better built, its CPI range is wide, and you can adjust the set CPI more precisely. On the other hand, the Corsair’s click latency with its receiver is slightly lower, and it has Bluetooth support.
The Corsair HARPOON RGB Wireless and the Logitech G305 LIGHTSPEED are both great wireless FPS gaming mice. The Corsair can be used with its USB receiver, as well as with Bluetooth or wired, while the Logitech can only be used with its proprietary receiver. While the Logitech has a wider and more adjustable CPI range, the Corsair's sensor performance is slightly more consistent. Both mice are recommended for a claw or fingertip grip, though those with small hands will be better off with the Logitech, and extra-large hands will have a better time with the Corsair.
The Logitech G903 LIGHTSPEED is a better wireless gaming mouse than the Logitech G305 LIGHTSPEED. It feels better built and has a more comfortable design. It can also be used by almost any hand size in every grip type, except for small hands with a fingertip grip. It has more programmable buttons, and you can unlock the scroll wheel for infinite scroll. On the other hand, the G305 is a smaller and more lightweight mouse that may be easier to travel with.
The Logitech G305 LIGHTSPEED is better than the Corsair HARPOON RGB Gaming Mouse. The Logitech is a wireless mouse designed for a fingertip grip. It has a much better sensor with a wider CPI range, less CPI variation, and lower lift-off distance. However, the Corsair is a wired mouse designed for a claw grip, and it's lighter.
The Logitech G305 LIGHTSPEED is a better wireless gaming mouse than the Logitech MX Anywhere 2S, but the Anywhere 2S is designed for office work and travel. The G305 LIGHTSPEED has a much wider CPI range and a lower click latency. However, the MX Anywhere 2S has Bluetooth support, which the G305 lacks.
The Logitech G305 LIGHTSPEED is a better overall mouse than the Logitech M510 when it comes to performance, but its low-profile design and egg-shaped body may not be for everyone working in an office. The M510 feels a bit cheaper but is suited for a wider variety of hand sizes and grips. The M510 is more office-oriented, while the G305 is geared towards gaming.
The Logitech G305 LIGHTSPEED is a better gaming mouse than the Logitech G602. It has a much wider CPI range, and its small frame is suitable for most hand sizes, though people with larger hands may have a tough time getting a comfortable palm grip. While the G305 is smaller and lighter, the G602 feels more comfortable, thanks to its thumb rest.
The Logitech G305 LIGHTSPEED and the Logitech G203 LIGHTSYNC are very similar gaming mice but have a few standout differences. The LIGHTSYNC scores better for gaming across the board, but it's wired only, has a narrower CPI range, and while it has a somewhat better click latency, most people likely won't notice a difference. Despite scoring lower, the LIGHTSPEED may be a better gaming mouse for some. It connects wirelessly with a USB receiver but is heavier since it's powered by an AA battery. It doesn't have RGB lighting, but this may not bother some people. Lastly, while both mice use the same software, the LIGHTSPEED has onboard memory for custom settings. Both mice are well-suited for all hand sizes using a fingertip grip, and only those with larger hands may find a palm or claw grip uncomfortable.
The Logitech G PRO HERO is much better than the Logitech G305 LIGHTSPEED. Although they have the same shape, the PRO is lighter, as it doesn't operate on a disposable battery like the G305. Also, it has a much wider CPI range. The click latency is about the same on both mice, so you shouldn't feel more delay on the G305 even though it's wireless.
The Logitech G403 HERO is a better gaming mouse than the Logitech G305 LIGHTSPEED. The G403 is lighter, and it feels better built. It's very well-suited for a palm grip, though people with medium and large hands can also use it with a claw grip. It also has a wider CPI range. That said, the G305 is smaller and connects wirelessly with its USB receiver, making it a better choice if you plan to bring it with you on the go.
The Glorious Model O Wireless performs slightly better for gaming than the Logitech G305 LIGHTSPEED. Both mice are fairly small, but the Glorious is quite a bit lighter, thanks to its honeycomb design. It’s well-suited for medium or large hands using most grip types, and it feels more solid and comfortable overall. On the other hand, the G305 is a great choice for a fingertip grip, and it has more programmable inputs. However, it only connects wirelessly, while the Glorious can be used wired or wirelessly.
The Razer Mamba Wireless is a slightly better FPS gaming mouse than the Logitech G305 LIGHTSPEED. The Razer feels better built and more comfortable, especially for fans of palm grip. It can be used wired or wirelessly, unlike the Logitech, which is wireless-only. Finally, the Razer has a higher max CPI and more programmable buttons. On the other hand, the Logitech is better suited for a fingertip grip, has slightly lower click latency, and a lower lift-off distance. Logitech's G HUB software is also fully compatible with Windows and macOS, while Razer Synapse 3 is only compatible with Windows.
The Logitech G305 LIGHTSPEED is a wireless-only mouse, while the Razer DeathAdder Essential is wired. The Logitech has an ambidextrous egg shape with two buttons on its left side and onboard memory. It has a very wide CPI range, a more precisely adjustable CPI, a lower lift-off distance, and lower click latency. It's suitable with a fingertip grip for any hand size, but people with larger hands may feel the mouse is too small for a palm or claw grip. On the other hand, the Razer is a right-handed mouse, and its larger size is better suited for larger hands.
The Razer Atheris and the Logitech G305 LIGHTSPEED are both very good mice. They each have two additional side buttons and are fairly small and good for travel, though the Razer is a little smaller. However, the Logitech feels better built and is more suitable if you prefer to use a palm grip with your mouse. The Logitech also only uses one AA battery, while the Razer uses two. On the upside, you can use the Razer with both the USB receiver or Bluetooth.
The Glorious Model D and the Logitech G305 LIGHTSPEED are both gaming mice. The Glorious is right-handed and wired, while the Logitech has an ambidextrous shape and connects wirelessly with its USB receiver. The Glorious weighs significantly less than the Logitech. It also has feet that glide much more smoothly on mousepads and desks. On the other hand, the Logitech feels sturdier and has a slightly lower minimum CPI. It also has a lower lift-off distance, and you can set its CPI more precisely by increments of 50. Also, it has software compatible with Windows and macOS, while the Glorious software is only compatible with Windows.
The Logitech G Pro Wireless is a better gaming mouse than the Logitech G305 LIGHTSPEED. It has a better sensor performance and is noticeably lighter, which is great for quick movements. It also feels a bit better built, and it can be used wired. On the other hand, the G305 has a much lower profile, which is great if you're a fingertip grip user. However, it can't be recharged and uses a single AA battery for power. It also doesn't have RGB lighting like the G Pro Wireless and only has one set of side buttons on the left, while the G Pro Wireless has two side buttons on either side.
For most uses, the Logitech G703 LIGHTSPEED Wireless Gaming Mouse with HERO Sensor is better than the Logitech G305 LIGHTSPEED. The G703 is lighter, more comfortable to use, and has better performance due to its wider CPI range and lower CPI variation. Its build quality also feels better, and it has RGB lighting, which the G305 lacks. However, the G305 is smaller and more portable, and its ambidextrous shape makes it more suitable for left-handed use even though its side buttons are on the left side.
The Logitech G305 LIGHTSPEED and the Logitech G502 LIGHTSPEED are quite different, though both are good wireless gaming mice. The G305 is quite a bit smaller and a little lighter. It has an ambidextrous shape that's well-suited for a fingertip grip, though people with small and medium hands can also use it with a palm or a claw grip. On the other hand, the G502 has a much more aggressive design with sharp angles and more side buttons. It feels more comfortable overall, with a right-handed slant and a thumb rest. However, people with small hands may have a hard time using it with any grip type. Performance-wise, the G502 has a wider CPI range and a lot more programmable inputs. It's also possible to use it wired, while the G305 is wireless-only.
The Logitech G305 LIGHTSPEED and the Logitech G303 Shroud Edition are comparable wireless gaming mice. They both have an ambidextrous shape with two buttons on their left side. The G305 uses a disposable battery to power on, and it's much heavier. Its shape and size are better suited for smaller hands than the G303. Comparatively, the G303 has a rechargeable battery, and it has a diamond shape that makes it uncomfortable to use with a palm grip. However, it's better suited for larger hands using a claw or fingertip grip.
The Logitech G203 Prodigy and the Logitech G305 LIGHTSPEED are practically the same mice, but the G203 is wired-only while the G305 is wireless-only. You can set a higher CPI on the G305, but performance-wise, there isn't much difference between these two mice. That said, the G203 has an RGB lighting strip.
The Logitech G403 Wireless Gaming Mouse is better than the Logitech G305 LIGHTSPEED if you're looking for an ergo-shaped mouse for a palm grip. It feels a bit better built and is more comfortable to use during long periods. The G305 has a lower-profile design, which is better for people who like the fingertip grip. The G305 Wireless uses a single AA battery, while the G403 Wireless is rechargeable and can also be used wired.
The Logitech G305 LIGHTSPEED and the DELUX M800 Wireless are both cheap wireless gaming mice. The DELUX has a much lighter weight and a lower minimum CPI, and you can use it both wired or wirelessly. However, the Logitech has a lower lift-off distance, a significantly more consistent sensor, a more precisely adjustable CPI, and much lower click latency.
The Logitech MX Master 2S and the Logitech G305 LIGHTSPEED are designed with different uses in mind. The MX Master 2S is an office mouse, with a thumb rest and a side horizontal scroll wheel to help navigate big documents and spreadsheets. The G305 is designed for gaming, with two side buttons, a higher maximum polling rate, and much lower click latency. The MX Master 2S is a bit larger and may not be comfortable for small hands. The G305 is suitable for most hand sizes in any grip type, though those with larger hands may not find it comfortable with a palm grip.
The Razer DeathAdder Elite and the Logitech G305 LIGHTSPEED are both very good gaming mice. The Logitech is wireless, while the Razer is wired. Both have similar weight and two programmable side buttons. Due to its smaller size, the Logitech may be more suitable for people with small hands, especially in a claw or fingertip grip. On the other hand, some may prefer the more comfortable, slanted shape of the Razer.
The Logitech G305 LIGHTSPEED is more versatile and has better performance than the Redragon M601 RGB Centrophorus. The Logitech connects wirelessly with its USB receiver while the Redragon is a wired-only mouse. The Logitech has a CPI you can more precisely adjust within a broader range, a lower lift-off distance, a significantly lower click latency, and mouse feet that glide more smoothly. It also has customization software compatible with Windows and macOS, while the Redragon software is only compatible with Windows. On the other hand, the Redragon is more lightweight and includes a tunable set of weights, a feature that the Logitech lacks.
The Logitech G305 LIGHTSPEED and the Logitech G5 are both gaming mice but with very different designs. The Logitech G5 is a right-handed, wired mouse with only one side button on its left. It's one of Logitech's first gaming mice, and it includes a weight cartridge with extra weights. On the other hand, the G305 LIGHTSPEED is a small, ambidextrous mouse that can only be used wirelessly and uses a single AA battery for power. It has lower click latency and an updated sensor with a wider CPI range and a much lower lift-off distance.
The Logitech G305 LIGHTSPEED is a wireless gaming mouse, while the DELUX M700 is a wired ultra-light gaming mouse. The DELUX is lighter and has smoother-gliding mouse feet. It also has a much wider CPI range. However, its click latency is disappointingly high, which may be a deal-breaker for some gamers. On the other hand, the Logitech feels significantly more responsive and has a lower minimum lift-off distance, so the sensor shouldn't track your movements when you reposition your mouse. Also, its customization software is available on both Windows and macOS, while the software for the DELUX is only compatible with Windows.
The Logitech G305 LIGHTSPEED is a good wireless mouse for many uses, while the Redragon M913 Impact Elite is an excellent mouse for MMO gaming. The Logitech is much lighter and has an ambidextrous, egg-shaped body with two side buttons on the left. It connects wirelessly with its USB receiver. It also has a more precisely adjustable CPI, much lower click latency, and software compatible with Windows and macOS. Comparatively, the Redragon has a right-handed shape with a thumb, pinky, and ring finger rest. It connects either wired or wirelessly with its USB receiver and has a 12-button side panel.
The Logitech G305 LIGHTSPEED is a good wireless gaming mouse with an ambidextrous shape, while the DELUX M625 is a good wired gaming mouse with a right-handed shape. The Logitech connects wirelessly with its USB receiver and uses a single AA battery. It has mouse feet that glide more smoothly, a more precisely adjustable CPI, a lower lift-off distance, and much lower click latency. It also has customization software compatible with Windows and macOS, while the DELUX software is only compatible with Windows. On the other hand, the DELUX has a much higher maximum CPI, and RGB lighting, which the Logitech lacks.