Products
Razer Viper V3 Pro
ATK Blazing Sky U2 Ultimate
Tested using Methodology v1.5.1
Updated Feb 19, 2026 05:04 PM
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Tested using Methodology v1.5.1
Updated Jan 20, 2026 05:52 PM
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ConnectivityWireless
Type
Standard
Default Weight
53.8 g
Ambidextrous
Shape Only
ConnectivityWireless
Type
Standard
Default Weight
55.2 g
Ambidextrous
Shape Only
Our Verdict
Razer Viper V3 Pro
ATK Blazing Sky U2 Ultimate
Both the Razer Viper V3 Pro and the ATK Blazing Sky U2 Ultimate are lightweight wireless gaming mice. The Razer has a lower-profile shape that accommodates a wider range of hand sizes and grip styles overall. It also offers slightly better raw performance, although the difference isn’t noticeable in-game. By comparison, the ATK has a shape designed specifically for a claw grip, with a much narrower midsection and a wider, more supportive rear. The ATK also has a significantly larger battery capacity.
Variants
- Viper V3 Pro (Black)
- Viper V3 Pro (Faker Edition)
- Blazing Sky U2 Ultimate (Black)
- Blazing Sky U2 Ultimate (White)
Check Price
Black
Viper V3 Pro
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Black
Blazing Sky U2 Ultimate
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Amazon.com
White
Viper V3 Pro
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White
Blazing Sky U2 Ultimate
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Amazon.com
Faker Edition
Viper V3 Pro
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Sentinels Edition
Viper V3 Pro
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Main Differences for
Work
Work
Threshold
Work
7.3
7.1
Additional Buttons
7.4
6.5
Full Comparison
Design
Style
Style Picture
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Type
Standard
Standard
Coating
Matte
Matte
Lighting Color
No Lighting
No Lighting
Shape
3D Model
Preview 3D
Preview 3D
Length
5.0" (127 mm)
4.9" (124 mm)
Width
2.5" (64 mm)
2.6" (65 mm)
Height
1.6" (40 mm)
1.5" (39 mm)
Grip Width
63 mm
57 mm
Ambidextrous
Shape Only
Shape Only
Left-Handed Friendly
Yes
Yes
Finger Rest
No
No
Build Quality
8.5
8.5
Build quality picture
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Weight
9.3
9.3
Minimum Weight Picture
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Lowest Weight
53.8 g
55.2 g
Default Weight
53.8 g
55.2 g
Weight Distribution
Centered
Centered
Extra Weights
No
No
Hand Size Recommendation
Palm Grip Hand Recommendation
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Claw Grip Hand Recommendation
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Fingertip Grip Hand Recommendation
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Wireless Versatility
7.2
7.2
Maximum Of Paired Devices
1
1
Bluetooth
No
No
Receiver
Yes
Yes
Battery Type
Rechargeable
Rechargeable
Use When Charging
Yes
Yes
On/Off Activation
Auto Off And On/Off Switch
Auto Off And On/Off Switch
Receiver Extender
Yes
Yes
Receiver Storing
No
No
Battery Indicator
Yes
Yes
Cable
Connectivity
Wireless
Wireless
Cable Length
6.2 ft (1.9 m)
5.2 ft (1.6 m)
Cable Type
Paracord-like
Paracord-like
Permanent Kink
Yes
Yes
Port Type: Mouse End
USB-C
USB-C
Port Type: PC End
USB-A
USB-A
Mouse Feet
9.5
9.0
Mouse Feet picture
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Gliding Experience
Very Good
Good
Material
Virgin Grade PTFE
Virgin Grade PTFE
Extra Included
No
Yes
In The Box
In the box picture
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Control
Main Button
Actuation Graph
Preview Graph
Preview Graph
Force/Distances Graph
Preview Graph
Preview Graph
Switch Type
Optical
Optical
Switch Model
Razer Optical Mouse Switch Gen 3
Omron Opticals
Additional Buttons
7.4
6.5
Buttons Picture
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Total Number Of Buttons
6
6
Number Of Side Buttons
2
2
Number Of Programmable Inputs
14
6
Profile Switching Button
Yes
No
Gesture Support
No
No
Click Latency
9.9
9.9
Latency Data
Preview Graph
Preview Graph
Expected Connection
1.0 ms
1.1 ms
Wired
1.4 ms
0.9 ms
Receiver
1.0 ms
1.1 ms
Bluetooth
N/A
N/A
CPI
9.7
9.0
CPI Graph
Preview Graph
Preview Graph
SRAV Close-Up
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SRAV @ 1600 CPI
-0.02%
0.67%
SRAV @ 800 CPI
-0.08%
0.00%
SRAV @ 400 CPI
0.08%
0.58%
SRAV @ Fixed CPI
N/A
N/A
Precision Error Between Speeds
0.69%
0.64%
Precision Error Between CPI
0.69%
0.84%
Worst Tracking Error
-3.62%
-5.75%
Minimum CPI
100 CPI
10 CPI
Maximum CPI
35,000 CPI
42,000 CPI
CPI Adjustment Steps
1 CPI
10 CPI
Sensor Latency
9.7
9.5
Sensor Latency Transition Graph
Preview Graph
Preview Graph
Delay To Start Of Movement
10.7 ms
10.5 ms
Delay At Half Movement
1.4 ms
1.9 ms
Delay To End Of Movement
0.7 ms
1.4 ms
Sensor Specifications
Sensor Technology
Optical (LED)
Optical (LED)
Sensor Model
Razer Focus Pro 35K
Pixart PAW3950Ultra
Works On Glass
Yes
Yes
Minimum Lift Off Distance
1.2 mm
1.2 mm
Maximum Polling Rate
8000 Hz
8000 Hz
Mouse Wheel
Mouse wheel picture
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Scroll Wheel Type
Notched Wheel
Notched Wheel
Scroll Wheel Tilt
No
No
Thumb Wheel Type
No
No
Noise
Noise Video
Click Noise
Quiet
Quiet
Operating System And Software
Configuration Software
Software Tour
Software Name
Razer Synapse 3
ATK HUB
Software Windows Compatibility
Yes
Yes
Software macOS Compatibility
Yes
Yes
On-Board Memory
Yes
Yes
CPI (DPI) Adjustment
Yes
Yes
Polling Rate Adjustment
Yes
Yes
Profile Configuration
Yes
Yes
Profile Auto-Switching
Yes
No
RGB On/Off
No RGB
No RGB
Mouse Compatibility
10
10
Windows Compatibility
Fully
Fully
macOS Compatibility
Fully
Fully
Check Price
Black
Viper V3 Pro
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Black
Blazing Sky U2 Ultimate
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White
Viper V3 Pro
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White
Blazing Sky U2 Ultimate
SEE PRICE
Amazon.com
Faker Edition
Viper V3 Pro
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Amazon.com
Sentinels Edition
Viper V3 Pro
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Amazon.com
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Razer Viper V3 Pro
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Razer Viper V3 Pro vs ATK Blazing Sky U2 Ultimate: Main Discussion
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