Your keyboard is equipped with a proximity sensor that detects when your hands hover close to the keyboard.

Proximity detection will not work when the keyboard is charging — you have to press a key on the keyboard to turn the backlight on. Turning the keyboard backlight off while charging will help with the charging time.

The backlighting will stay on for five minutes after typing, so if you are working in the dark, the keyboard will not turn off while typing.

Once fully charged and the charging cable is removed, proximity detection will work again.