The Finalmouse UltralightX is a lightweight, wireless gaming mouse. It has a symmetrically shaped body with honeycomb-shaped cutouts that help reduce the overall weight. The body is made of carbon fiber composite, which Finalmouse advertises has a better strength-to-weight ratio than either plastic or magnesium alloy. This mouse uses PixArt's flagship 3395 sensor, and at the time of writing, it supports a maximum wireless polling rate of 4000Hz. Finalmouse has stated that they're working on releasing a firmware update to increase the maximum wireless polling rate to 8000Hz in the future.
You can buy the Finalmouse UltralightX in several different sizes. We bought and tested the medium-sized (Lion) variant. Smaller (Cheetah) and larger (Tiger) size variants are also available. For more details, see the Differences Between Variants section below.
Our Verdict
The Finalmouse UltralightX is acceptable for work but isn't designed explicitly designed with this usage in mind. That said, it's very lightweight and has a comfortable symmetrical shape. Unfortunately, while you can connect to it wirelessly with its USB receiver, it doesn't support Bluetooth or multi-device pairing. Also, while it has a web-based configurator, you can't remap buttons without third-party software. Lastly, the scroll wheel feels cheap and lacks helpful productivity features like L/R tilt inputs and free-scrolling.
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Connects wirelessly with its 2.4Ghz receiver.
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Remarkably lightweight; less fatiguing to use for long stretches compared to heavier productivity mice.
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Carbon fiber body is noticeably flexible.
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Left-and right-click buttons feel slightly mushy.
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The scroll wheel feels somewhat cheap and its coating isn't very grippy. Additionally, you can unintentionally actuate the scroll wheel button by pushing the wheel to the right.
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Can't reprogram buttons without third party software.
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Doesn't support Bluetooth; no multi-device pairing.
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Scroll wheel lacks a free-scrolling mode and L/R tilt inputs.
The Finalmouse UltralightX is a superb FPS gaming mouse. Its carbon fiber composite body makes it remarkably lightweight and easy to move quickly and accurately. It also has incredibly low and consistent click latency and outstanding all-around sensor performance that's more than suitable for gaming at any competitive level. Unfortunately, it also suffers from some build quality issues. The left-and right-click buttons feel mushy, and the scroll wheel feels cheap. Additionally, although the body is very strong, it's also quite flexible, and if you apply pressure to the underside, you can separate the top and bottom pieces of the chassis. While these issues are noticeable, we don't expect them to impact your in-game performance negatively. For more details about these issues, see the Build Quality section below.
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Remarkably lightweight.
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Maximum wireless polling rate of 4000Hz.
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Incredibly low and consistent click latency performance.
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Outstanding all-around sensor latency and accuracy.
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Carbon fiber body is noticeably flexible.
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Left-and right-click buttons feel slightly mushy.
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The scroll wheel feels somewhat cheap and its coating isn't very grippy. Additionally, you can unintentionally actuate the scroll wheel button by pushing the wheel to the right.
The Finalmouse UltralightX is adequate for MMO gaming but has fewer side buttons than a dedicated MMO gaming mouse, and you can't remap buttons without third-party software. That said, it's exceptionally lightweight and has incredibly low and consistent click latency and outstanding sensor performance, providing an exceptionally responsive-feeling in-game experience.
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Remarkably lightweight.
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Incredibly low and consistent click latency performance.
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Outstanding all-around sensor latency and accuracy.
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Carbon fiber body is noticeably flexible.
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Left-and right-click buttons feel slightly mushy.
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The scroll wheel feels somewhat cheap and its coating isn't very grippy. Additionally, you can unintentionally actuate the scroll wheel button by pushing the wheel to the right.
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Significantly fewer side buttons compared to dedicated MMO gaming mice.
The Finalmouse UltralightX delivers fantastic raw performance. Its click latency is incredibly low, and the sensor latency and accuracy are outstanding. This mouse also supports a maximum wireless polling rate of 4000Hz, delivering slightly better and more consistent overall performance over a standard 1000Hz polling rate. However, using higher polling rates also requires considerable CPU resources and consumes battery power much more quickly.
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Maximum wireless polling rate of 4000Hz.
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Incredibly low and consistent click latency performance.
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Outstanding all-around sensor latency and accuracy.
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Only five fixed CPI presets, which may take some getting used to if you prefer a CPI setting that isn't supported.
- 6.3 Work
- 9.4 Video Games (FPS)
- 6.8 Video Games (MMO)
- 9.7 Raw Performance
- Updated Feb 26, 2024: We've added a link to the newly-reviewed WLmouse BEAST X in the Build Quality section of this review.
- Updated Feb 23, 2024: We've updated the photos in the Hand Size Recommendation section to better reflect the size and shape of the mouse.
- Updated Feb 06, 2024: We've added a link to the newly reviewed G-Wolves HSK Pro 4K in the Hand Size Recommendation section of this review.
- Updated Jan 05, 2024: Review published.
- Updated Jan 03, 2024: Early access published.
- Updated Dec 12, 2023: Our testers have started testing this product.
- Updated Dec 07, 2023: The product has arrived in our lab, and our testers will start evaluating it soon.
- Updated Aug 01, 2023: We've purchased the product and are waiting for it to arrive in our lab.
Differences Between Sizes And Variants
The Finalmouse UltralightX is available in two color options and three size variants. The color options include a gold and black colorway called Guardian and a blue and black colorway called Phantom. The three sizes available are small (Cheetah), medium (Lion), and large (Tiger).
We bought and tested the medium (Lion) variant in the Phantom colorway. You can see the label for the unit we bought and tested here. This image is mostly obscured as the label is inside the honeycomb shell. The model number on our unit is S/N: MA233717514.
We expect all size variants to perform similarly, and we expect most of our tests will broadly apply to all sizes except for obvious tests like Shape and Weight.
| Name | Color Options | Advertised Weight | Advertised Dimensions |
| UltralightX (Cheetah/Small) | Guardian, Phantom | 31 g | 115.6mm Length x 54.1mm Grip Width x 35.2mm Height |
| UltralightX (Lion/Medium) | Guardian, Phantom | 35 g | 121.3mm Length x 56.8mm Grip Width x 37mm Height |
| UltralightX (Tiger/Large) | Guardian, Phantom | 37 g | 126mm Length x 59mm Grip Width x 38.4mm Height |
Note: The Finalmouse UltralightX unit we purchased is a Batch 1 production model. Finalmouse has since released Batch 2 models. Finalmouse advertises that these newer models have several build quality revisions. You can read Finalmouse's statement concerning these differences here.
If you have this mouse and want to share your experiences with us, we'd love to hear from you in the forums.
Compared To Other Mice
The Finalmouse UltralightX shares the same honeycombed, symmetrical shape as Finalmouse's previous Starlight-12 Medium. Still, it has an upgraded sensor and is the first Finalmouse release to support polling rate settings over 1000Hz. Additionally, this mouse's body is made of a carbon fiber composite, which Finalmouse advertises as having a significantly better strength-to-weight ratio compared to ABS plastic used by most gaming mice, as well as the magnesium alloy material used in the body of the Starlight-12. Until now, gaming mice with carbon fiber bodies were limited to much more niche and expensive models such as the Zaunkoenig M2K.
The UltralightX also marks the first mouse Finalmouse has committed to keeping in continuous production. It's noteworthy as Finalmouse's previous releases have been limited quantity drops, often making them difficult to buy without resorting to the reseller market. That said, at the time of writing, the size of the production batches for the UltralightX remains small related to the demand, and all models are currently sold out. If you're interested in this mouse, you may need to check back often and buy this mouse soon after a new production batch is made available. You can reference the Finalmouse Twitter feed for updates on new batch releases here.
For more recommendations, see our picks for the best lightweight mouse, the best FPS mouse, and the best wireless gaming mouse.
The Finalmouse UltralightX (Medium/Lion size variant) and the WLmouse BEAST X are both ultra-lightweight wireless gaming mice with virtually the same symmetrical shape. The Finalmouse is made of carbon fiber composite and has slightly better overall raw gaming performance. Unfortunately, we reviewed an early batch model with build quality issues. Reports from the community suggest that many of these issues have been addressed in later batches. We expect current models to be roughly comparable to the WLmouse regarding build quality. Comparatively, the WLmouse has a magnesium alloy body and is slightly more lightweight. Additionally, the WLmouse is more readily available as it has been continuously in stock at the time of writing, while the Finalmouse has only been released in small staggered batches.
The Razer Viper Mini Signature Edition and the Finalmouse UltralightX are lightweight wireless gaming mice with similar symmetrical shapes and body designs with weight-saving cutouts. The Razer has marginally better overall sensor performance. It's also somewhat heavier, and its body is made of magnesium alloy. Conversely, the Finalmouse model has marginally lower click latency performance, and its body is made of a carbon fiber composite, making it somewhat lighter.
The Finalmouse UltralightX and the Razer Viper V2 Pro are lightweight wireless gaming mice with similar low-profile, symmetrical shapes. The Finalmouse comes in three size variants and features a honeycomb body made of carbon fiber, making it significantly more lightweight. The Finalmouse has slightly better raw gaming performance. The Razer, on the other hand, is heavier and has a solid plastic shell. Both mice support polling rates higher than 1000Hz, but the Razer requires the purchase of a separate Hyperpolling Dongle to enable this functionality, while the Finalmouse supports higher polling rates natively.
The Finalmouse Ultralight X and the Finalmouse Starlight-12 Medium are both lightweight, wireless gaming mice with the same shape and honeycomb body designs. Altogether, the UltralightX provides better raw gaming performance and is significantly lighter as it's made of a composite carbon fiber material, while the Starlight-12 is made of a somewhat heavier magnesium alloy. Additionally, the Ultralight X supports polling rates higher than 1000Hz, while the Starlight-12 has a maximum wireless polling rate of 1000Hz.
The Pwnage StormBreaker and the Finalmouse UltralightX are lightweight wireless gaming mice with near-peer raw gaming performance. The bodies of both mice have cutout segments to reduce their overall weight. The Pwnage has a larger, right-handed shape and is made of magnesium alloy. On the other hand, the Finalmouse has a symmetrical shape, and its body is made of a carbon fiber composite, making it lighter.
The Finalmouse UltralightX and the G-Wolves HSK Pro 4K are high-performance, lightweight, wireless gaming mice. The G-Wolves is lighter but significantly smaller and only suitable for a fingertip grip. The Finalmouse has a more conventional symmetrical shape, so it's also suitable for claw and palm grip types. The two mice perform similarly, but the Finalmouse has better sensor latency performance.
The Zaunkoenig M2K and the Finalmouse UltralightX are gaming mice with carbon fiber body designs. The Zaunkoenig is lighter but significantly smaller and only suitable for a fingertip grip. The Zaunkoenig also lacks side buttons and is a wired-only model. The Finalmouse is somewhat heavier but large enough to accommodate palm or claw grip types. It's also a wireless model and has significantly better sensor performance.
Test Results
This mouse has a matte black carbon fiber composite body with honeycomb cutouts on the sides, top, and bottom. The left- and right-click buttons feature debossed/engraved linework patterns and small metallic-blue-colored accents. Additionally, there aren't any visible logos, and there's no RGB lighting.
This mouse shares the same shape as the mice in Finalmouse's Starlight-12 lineup and is dimensionally identical to the Finalmouse Starlight-12 Medium.
We bought and tested the medium (Lion) size variant of the UltralightX. Smaller (Cheetah) and larger (Tiger) size variants are also available. We've included more information, including advertised dimensions for these other sizes, in the Differences Between Variants section above.
Note: The 3D scanning tool has difficulty accurately capturing depth inside this mouse's honeycomb body. As a result, the scan displays a blurry texture layer inside the mouse. That said, the scale and dimensions of this scan are still accurate and aren't affected by this minor visual error.
This mouse isn't designed specifically for portability. While it isn't very big, it's somewhat bulky and lacks a compartment for storing its USB receiver. Additionally, its honeycomb design leaves the interior more open to collecting dust and debris.
The Finalmouse UltralightX has reasonably good build quality. The body is made of a carbon fiber composite. According to Finalmouse, this material has a much better strength-to-weight ratio than conventional ABS plastic or magnesium alloy, as used on their previous lineup of Finalmouse Starlight-12 mice.
This material feels very sturdy and is astonishingly lightweight. However, it's also quite flexible. Applying moderate pressure virtually anywhere on the mouse causes it to bend slightly. Additionally, if you apply pressure on the bottom of the mouse toward the back edge, it causes the bottom panel to separate a bit from the rest of the upper chassis at the seam. You can see a video of this issue here.
The left-and right-click buttons are very lightweight but have a somewhat mushy feeling. We also found during testing that you can actuate the scroll wheel button by pushing the scroll wheel to the right in its housing. We discuss this issue more at length in the Mouse Wheel section later on.
Note: The Finalmouse UltralightX we bought and tested is a production Batch 1 model. Finalmouse indicates they've made several minor engineering revisions for Batch 2 models onwards. You can read Finalmouse's statement here. From some accounts within the wider community who have received batch 2 copies, it seems that these revisions have largely addressed at least some of the build quality issues we experienced, notably the separation of the top and bottom panels demonstrated in the video above.
If you have this mouse and want to share your experiences with the build quality, we'd love to hear from you in the forums.
If you're interested in a similar wireless gaming mouse with the same shape and better build quality, check out our review for the WLmouse BEAST X.
The Finalmouse UltralightX is remarkably lightweight, making it extremely easy to move quickly and accurately.
We bought and tested the medium (Lion) size variant of this mouse. There's also an additional Small (Cheetah) and Large-sized (Tiger) variant available. For more details, see the Differences Between Variants section above.
Below, we've listed the advertised weights of all three sizes as found on this mouse's product page below.
- Cheetah (Small): 31 Grams
- Lion (Medium): 35 Grams
- Tiger (Large): 37 Grams
Finalmouse states that approximate weights are measured without skates and may have a variance of +-2g from unit to unit.
The Finalmouse UltralightX has a fairly low-profile, symmetrical shape with a small, centered hump and gently sloping sides. Its shape is best suited for claw and fingertip grip types.
We bought and tested the medium-size variant (Lion), which shares the same dimensions as the Finalmouse Starlight-12 Medium and best suits medium- or small-sized hands.
There's also a smaller size variant (Cheetah) and a larger size variant (Tiger) available. For more details about these size variants, see both the Shape and the Differences Between Variants sections above.
If you're looking for a similarly ultra-lightweight mouse but exclusively use a fingertip grip, check out the G-Wolves HSK Pro 4K.
On the product page for this mouse, Finalmouse states that "gamers can expect to reach an average of two months without needing to charge their ULX." We expect this estimate to be optimistic, assuming low daily usage and likely using a 1000Hz polling rate.
The battery life you can expect will be highly dependent on average daily usage as well as the polling rate you choose, as higher polling rate settings consume significantly more battery life. If you have a fairly high (5+ hours) of daily usage at polling rates higher than 1000Hz, we expect you may need to recharge your mouse as often as every few days.
If you have this mouse and want to share your experiences with its battery life, we'd love to hear from you in the forums.
This mouse includes a braided charging cable. It's quite stiff and drags somewhat on desks and mousepads. This cable is noticeably less flexible and is made of a cheaper feeling material than the cable included in other recent Finalmouse releases, like the cable included with the Finalmouse Starlight Pro - TenZ Medium.
This mouse's feet glide very easily on mousepads with only marginal felt friction when used directly on desks or harder mousepads. The feet have some sharp edges, but this doesn't noticeably add any drag due to the lightweight nature of this mouse. Third-party replacement feet are also available.
- Wireless receiver dongle (USB-C)
- Braided cable (USB-C to USB-A)
- Adhesive grips
- User documentation
If you want to reprogram any of the buttons on the Finalmouse UltralightX, you'll need to use third-party software, as the XPANEL web-based configuration client doesn't support button mapping.
There's a power switch on the bottom of the mouse.
This mouse has exceptionally low and consistent click latency performance. It delivers an exceptionally responsive-feeling experience for playing games in any genre and at any competitive level.
We performed our click latency testing at a polling rate of 4000Hz, which is the current maximum polling rate at the time of writing.
This mouse offers exceptional CPI performance. Its sensor delivers outstanding tracking accuracy, and the physical movements you make with your mouse translate extremely close to your cursor movements on-screen.
This test was conducted with a polling rate setting of 4000Hz, which is the current maximum polling rate at the time of writing.
This mouse provides outstanding sensor latency performance. The sensor reacts exceptionally quickly when you move your mouse, and these movements almost perfectly match the timing of the cursor movements you see on the screen.
We performed our sensor latency test with the Motion Sync setting toggled off, as it can add up to 1 ms of added motion latency. We also tested with the polling rate set to 4000Hz, which is the maximum setting available at the time of writing.
Note: The latency CPI graph above lacks data for the 6000 CPI setting because this mouse only has five fixed CPI settings and doesn't have a 6000 CPI preset.
At the time of writing, the polling rate options are 500Hz, 1000Hz, 2000Hz, and 4000Hz. This product page on the Finalmouse website indicates that the Finalmouse UltralightX supports a maximum wireless polling rate of 8000Hz, but at the time of writing, this feature remains in testing, as can be seen in this image of the polling rate options on the web-based configuration client. Finalmouse has stated they'll be releasing a firmware update to increase the polling rate to 8000Hz. We plan on retesting this mouse once the update is released.
This mouse has five fixed CPI settings: 400, 800, 1600, 3200, and 6400. With the web-based configuration client, you can toggle between CPI presets, polling rates, and lift-off distances.
The scroll wheel on the FInalmouse UltralightX operates quietly, and it feels reasonably precise with defined notches between steps. However, the overall material quality feels slightly cheap, and the surface finish isn't very grippy compared to more textured or rubberized scroll wheel surfaces on many other gaming mice, including the Finalmouse Starlight Pro - TenZ Medium. You may find the finish slippery, especially if your hands tend to sweat more.
During testing, we found that you can actuate the middle mouse button if you push the mouse wheel to the right in its housing with fairly light pressure. It's a somewhat commonplace issue found on many gaming mice. Some people don't mind or even prefer a mouse wheel with this functionality, but it's unclear if it's an intentional design decision. Depending on how you hold your mouse, it can result in occasional middle mouse click actuation.
The left- and right-click buttons, side buttons, and the scroll wheel operate quietly and are unlikely to bother anyone around you.
The Finalmouse UltralightX uses XPANEL, which is a web-based configuration client that you can access from Finalmouse's website here. This utility lets you choose between polling rates, lift-off distance options, and five CPI presets. You can also toggle Motion Sync and adjust the behavior of the LED on the wireless receiver dongle.