Product Description,1.Water-resistance,instant zooming,18650 lithium rechargeable battery 2.Voltage: 3.7V 3.Working current: 350 mA 4.Working time: 12 hours 5.LED mode: 1W CREE P4 6.LED lifetime: 100,000 hours 7.Illuminance: 80-110 for P4; 8.Switch: Self-locking function.SpecificationsAppearance size: L118mm*Φ34.6mm Weight:144g (with battery)