Software

As one would expect, the Pro X Superlight 2 is compatible with Logitech's staple software, GHUB. During testing, I've found GHUB mostly bug-free, aside from an issue where dragging the CPI slider to the right didn't result in the maximum value being selected, but rather some random value close to it. Hence, entering the maximum value manually is the only way to attain the desired step. In addition, when switching the "advanced" checkbox on, the shown CPI steps will be wrong. Resource usage is quite substantial, especially in terms of RAM. Thankfully, the latest version of Onboard Memory Manager likewise is compatible with the Pro X Superlight 2, offering almost the same amount of options as GHUB at a fraction of the RAM usage.

All settings are accessible through two different tabs. The first tab contains CPI adjustment at a range from 100 to 32,000 CPI in varying increments (for details, refer to the FAQ), for up to five levels. CPI values can be entered manually, and any non-native values are automatically truncated to the next native value. Upon checking the "advanced" setting, CPI can be set independently for the x and y-axis, and lift-off distance may be adjusted between three levels (low, medium, high), though the latter setting requires "Gaming Mode Surface" to be enabled in the device settings. Polling rate can be set to 125, 250, 500, or 1000 Hz in wired mode, whereas wireless mode also allows 2000 or 4000 Hz. In addition, a sensor calibration may be performed. The second tab includes button remapping, allowing one to rebind all buttons to mouse, keyboard, media, or macro functions. Furthermore, a shift button may be defined, allowing one to access a secondary set of binds upon pressing it. Modifying these settings is only possible if the mouse isn't set to onboard memory mode. If onboard memory mode is active, the only possible course of action is enabling previously set profiles. Regardless of onboard memory mode, device settings are always accessible, which give access to the "Gaming Surface Mode" as well as the switch configuration setting, with "hybrid" and "optical only" being the available options. Lastly, profile management is available, too.

All setting changes are saved live to the currently active profile, which may be saved to the onboard memory. On my system, the software had a RAM footprint of 210 MB on average when running in the foreground, which doesn't change when minimized, but is lowered to 58 MB when minimized to the system tray. Upon exiting the application, a single process with a RAM footprint of 11 MB keeps running. The latter process needs to be running, otherwise GHUB won't launch successfully.

Battery Life

On the Pro X Superlight 2, battery life depends on the set polling rate and switch configuration setting. Going by the battery life calculator found in GHUB, if set to 1000 Hz, battery life will be 96 hours in optical switch mode and 104 hours in hybrid switch mode. Set to 2000 Hz, battery life will be 55 hours in optical switch mode and 61 hours in hybrid switch mode. Finally, at 4000 Hz, battery life will be 42 hours in optical switch mode and 48 hours in hybrid switch mode. A percentage-based battery life indicator with seemingly single-digit precision is present in the software, but since the Pro X Superlight 2 lacks a fuel gauge IC, the numbers given tend to be rather inaccurate and unreliable. For instance, after charging the mouse to 99%, turning the mouse off and on resulted in the indicator showing 60% charge, despite the measured current clearly proving that the battery was fully charged. For the record, after eight hours of continuous use at 2000 Hz polling rate, the indicator stood at 91%.

Using the included USB Type-A to Type-C charging cable, I also measured the charging speed during the constant current stage, which sits at around 0.285 A. The battery has a capacity of 290 mAh (3.8 V) and utilizes a 3-pin JST connector.