Weight:254g Dimension:3.15in*3.15in*2.76in(8cm*8cm*7cm) Brand:UltraFire Model:L-25 Quantity:1 Piece Color:Black Material:Aluminum Alloy Emitter Brand:Cree LED Type:XM-L Emitter Bin:T6 Number of Emitters:1 Color Bin:Cool White Color Temperature:7000-7500K Working Voltage:3.6~4.2V Power Supply:1x18650/ 2x18650 (not included) Current:2500mA Theoretical Lumens:850 Actual Lumens:800 Runtime:2~3 hours Number of Modes:3 Mode Arrangement:Hi>Low>Fast Strobe Mode Memory:No Switch Type:Reverse Clicky Switch Location:Tailcap Lens:Plastic Convex Lens Reflector:No Beam Range:150m Mounting Location:Helmet Band Length:20cm Compatible Circumference:40~80cm Other Features:You can directly charge the battery via the 3.5mm jack. Packing List: 1 x Headlamp<img src="http://112.74.112.28/down/products/427824/427824_000.jpg">