LED: T6 LEDPower: 1 X 18650 3.7V Battery/3x AAA BatteryThe main purpose: DivingSize : 143mm x 35mm(Head Dia)/27mm(body Dia).Switch mode: Rotary switch (This is the rotary switch design,tightening the head of flashlight and the lamp light is open.and then to the right loosening some,the lamp light is closed. and then to left tightening will open again.)This product is convenient and practical for family standingSpecial operational needs (such as levee patrol, inspection, search, site inspection, security, first aid at sea, night observable, etc.)Outdoor activities (hiking, camping, hunting, survival, hiking, dive sea, Chuigou, etc.)Main Features: reflector / lens / light cupHigh quality can be used for more than 100,000 hours, which eliminates the trouble of replacing the lampSuitable for Self Safety, hunting, cycling, climbing, camping and outdoor activity.......Useage:Professional requirements(Appreciation jewelry,bet stone)Special work(Patrol,raid,on-site inspection,security,Marine emergency)Notice:Please remove the batteries when not being used.Please don't irradiate it to eyes,especially for children,children are lovely.It may cause temporary blindness for the harsh light of flashlight.