Software

Apparently dubbed "GameDev," the software for the VT9 Air has all options distributed across several tabs. The first tab allows setting profiles. The second tab includes button remapping and CPI configuration. All buttons can be bound to certain basic, key, or macro functions. CPI adjustment is possible for up to seven levels and ranges from 100 to 26,000 CPI in increments of 50. CPI values can be entered manually, and any non-native values are truncated to the next lower native value. The third tab likewise has basic Windows pointer settings along with miscellaneous other settings. Polling rate can be set to 125, 250, 500, 1000, 2000, 4000, or 8000 Hz, though 8000 Hz is an experimental setting in wireless operation. Lift-off distance can be adjusted in 11 steps. Sleep time can be set to a value between 5 and 120 minutes. Button Debounce Delay can be defined independently for press and release, with possible values being 1, 2, 4, 8,16, 24, and 32 ms. In addition, MotionSync can be enabled, which synchronizes SPI reads with USB polling events at the cost of up to an entire interval of added motion delay. Line Correction is a different name for angle snapping and can be turned on or off. Ripple Correction enables or disables smoothing, which is applied at higher CPI steps to reduce jitter, at the cost of increased motion delay. Lastly, the fourth tab houses the macro editor.

All setting changes are saved to the on-board memory, so the software does not need to be running (or be installed) all the time. On my system, the software had a RAM footprint of 172 MB on average when running in the foreground, which doesn't change when minimized, be it to the taskbar or system tray. Upon exiting the application, all processes are terminated, as they should be.

Battery Life

Rapoo states a maximum battery life of up to 160 hours. Polling rate is unspecified, though this figure likely is meant to apply to 1000 Hz. The software features a percentage-based battery indicator, though during testing, it did not budge at all, which is why I'm unable to confirm or deny the figure cited by Rapoo.

By default, the VT9 Air goes into sleep mode after ten minutes of inactivity, which is way too high and therefore should be lowered to the minimum of five minutes.

Using the included USB Type-A to Type-C charging cable, I measured the charging speed during the constant current stage, which sits at around 0.360 A when lifted and 0.344 A when not lifted. The battery has a capacity of 800 mAh (3.7 V) and utilizes a 3-pin JST connector.