Your gaming keyboard has Game Mode and Backlight brightness function controls.

Game Mode

Toggle the Game Mode button to enable or disable Game mode.

NOTE: The Windows key is disabled when the G710+ / G710 is in Game mode.

Backlight brightness control

The G710+ / G710 has dual-zone independent backlighting control. The backlight button on the left toggles backlight brightness for the WASD and arrow directional keys. The button on the right controls the backlight brightness for the remainder of keys on the keyboard.

NOTE: Each time you click the brightness button, the Backlight rotates through three preset brightness levels and off.