Software

The X15 comes with its own software called Unleash, which is also compatible with the X17, X20, Z15, and Z20. All options are accessible through five different tabs. The first one has settings for LED sleep mode, angle snapping (on/off), polling rate (125/250/500/1000/2000/4000/8000 Hz), and angle tuning, which allows one to adjust the sensor angle. The second page houses CPI adjustment settings for up to five levels ranging from 50 to 16,000 CPI in increments of 50, independently for x and y-sensitivity. The third page includes lighting settings and is detailed below. The fourth page allows any button to be remapped to mouse, keyboard, media, and macro functions. Lastly, a macro editor can be found on the fifth page, and profile management (five levels) is included as well. When applied, all settings 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 48 MB on average when running in the foreground, which doesn't change when minimized to the system tray. Upon exiting the application, all processes are terminated, as they should be.

Lighting

The X15 has three physical and logical lighting zones: side buttons, logo at the back, and the shift button on the right side. Through the software, the lighting zones can be operated independently or uniformly. Six pre-defined lighting effects are available: Static, Breathing, Rainbow, Pulse, Trigger (reacts to inputs), and Heartbeat. Brightness and transition speed can be adjusted, and for most effects, the colors are adjustable as well. If any other LED Sync-enabled devices are connected, their RGB effects can be synchronized. Of course, disabling the lighting altogether is possible as well.

Color accuracy and vibrancy are excellent throughout. Here's a short demonstration video in which I go through the Rainbow, Breathing, and Pulse lighting effects: