Your keyboard is equipped with an ambient light sensor that adapts the keyboard backlight according to the brightness of your room.

There are two default backlight levels that switch automatically:

• If the room starts getting dark (below 100 lux), the keyboard will set the backlighting to level 4. You can of course override this default level and increase or decrease the level.
• When the room is bright, over 100 lux, the backlighting will turn OFF as the contrast is no longer visible, and it won’t drain your battery unnecessarily.

When your keyboard is kept ON, it will detect whenever your hands approach and the backlight will be turned back on. The backlighting won’t turn back on if:

• Your keyboard has no more battery, below 10%.
• If the environment you're in is too bright.
• If you've turned it off manually or using Logitech Options software.