Material : Aerospace aluminum alloy Lamp : Super bright 3W Luxeon LED Output : above 125 lumens Battery type : 18650 rechargeable battery or 2 CR123A (not included) Voltage : 3.7-6V Specification :146mmX33mm Effective range :150m - 250m Weight : 145g O-ring sealed, Waterproof, Tail cap On/Off switch Ideal for Police, power failure, emergency, housework, traveling, camping, etc. Design specially for your needs is available. Pls feel free to contact me for more detail if you have any interests our products. If need other fabulours items for your needs, pls kindly view our extensive collection of items or email me for more.