Automatically lights on/off when the sensor switch is on. Wave your hand 10cm away from the head to turn on the light after pressing the sensor switch for 4 seconds.

USB rechargeable type 360 degree & 180-degree rotating head (Booklight) Clip-on any cap & life vest LED type: White COB LED + UV COB LED Brightness: 110 lumens Battery type: 500mAh Lithium polymer rechargeable battery Lighting modes: White COB: High Middle UV COB On Switch type: Push on/off switch Waterproof: IPX4