... beam*Lens: Toughened ultra-clear glass*Finish: HA II*Waterproof: IPX7 *Switch: Tail cap switch *Modes: Min-Mid-Max-Strobe-SOS*Battery: 2 ... ) * 22.5 mm(Head) * 20.5mm(Tail) Operation: *Press tail switch for turning light on/off. *With the light turned off ... , gently press(no click)the forward tail switch, the brightness level will switch between five modes(Max,Mid,Min,Strobe,SOS ...