[Applicable battery]: 1 x 18650 rechargeable lithium battery or 3 x AAA batteries (not included) Brightness: 300 lumens [Product material]: the body of the cylinder is made of high-quality aircraft aluminum, the surface is anodized and hardened, and it does not rust. Working voltage: 3.7V [color of product]: black [focal length]: telescopic focal length Switch: tail button to turn on this UV flashlight can easily find pet stains. It detects fungi in food, checks banknotes and receipts for counterfeits Versatile Design: Reliable, non-slip and waterproof design for multiple outdoor applications in harsh weather conditions. The body of this flashlight is made of aircraft grade aluminum alloy with military grade hard anodizing. Sturdy and durable enough for daily use for a long time. Simple operation: click the button to switch modes or press the button to switch modes.