The torch backup light has a dual white led and has a set screw for picatinny rail mounting.The low output illumination is for reduction during patrol, stealth structure search, approach to target, and breaching operations.It features a power button that has a simple on/off function, the battery door opens with a quarter-turn, and includes a cr2016 battery.Material: PolymerType: Weapon LightOutput: 20 LumensBulb Type: LEDBody Diameter: 1.48"Oal: 2.20"Weight: 0.78 ozBattery: CR2016 LithiumProofs: WaterproofColor: BlackFilter Color: WhiteSwitch Type: Push Button