1.Internal wiring applies the high efficient booster circuit, working voltageis wide and can utilize the batteries in the largest extent. 2.Output brightness can up to max 1800 lumens. 3.One button switch design, with 4 adjustable modes. 4.LED indication of the charging adapter for Power On/Charging/Full charge. 5.Perfect headlamp fits for outdoor activities camping,traveling,hiking. 6.With adjustable base for your convenient use. 7.With Re/Discharging Protection circuit. 8.Compatible for bicycle flashlight. 9. Excellent waterproof, suitable for outdoor environment, adverse weather conditions Except for diving 10.Battery Included or Not : NO 11.Battery Quantity : 2 x 18650 Lithium Battery 12.Battery Type : 18650 13.Power:30W 14.Emitters Quantity : 3 15.Color : black 16.LED Lifespan : >100000 Hours 17.Lumens Range: 2800 - 3000 LM 18.Power Source : Battery 19.Switch Location : head 20.Light color: Cold White 21.Function : Backpacking, walking, biking, rescue, adventure, night riding, wilderness survival, etc 22.QTY: 1pcs