Finalmouse UltralightX Mouse Review

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. Check out the Finalmouse ULX Pro Series if you're interested in this mouse but prefer a more colorful model.

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. During testing, we also found that you can actuate the scroll wheel button by pushing the scroll wheel to the right in its housing. We discuss this issue in the Mouse Wheel section.

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 comments.

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 or the WLmouse Beast X Max. Alternatively, if you prefer a mouse with a conventional solid plastic shell, better build quality, and similar performance, check out the Razer Viper V3 Pro.

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.