Automatically adjusts brightness and beam range using a sensor to detect ambient light. Basic Specifications: * Brightness: Max 355 lumens, Min 7 lumens * Beam Distance: Max 108m, Min 9m * Runtime: Max approx. 50h - Min 1h20min * Battery: USB rechargeable lithium-ion battery (can also use AAA batteries) * Weight: 187g * Waterproof Rating: IPX4 Thank you for viewing. Purchased in 2014, I bought it for long-distance trail running. I didn't do much night running, so I didn't use it often. It comes with a spare battery and an extension cord that allows you to attach the battery to your waist. There is no box, so it will be shipped in simple packaging. Thank you. Type...LED Light Brightness (Lumens)...300-499lm Features...Rechargeable, Dimmable