Specification: Material:Aluminum, black hard anodized. Mode:High/low. Throw distance:3394m 3.4KM. Lumens:Low mode 210/ High mode 568. Battery:21700 rechargeable lithium-ion battery. Runtime:4 hours 30 minutes/1 hour. Reflective system:Acrylic convex lens. Beam angle:1.8°. Light source:LEP module, wavelength 400-700nm, lifespan is about 10,000 hours. Switch:Tail button forward switch, 50,000 pressing life. Anti-drop height:1 meter. Protection level:Reaches IP67. Battery:Use 1 21700 Li-ion rechargeable battery (included). Weight:336±2g (without battery). Dimensions (±0.5mm):(Head diameter) 60.5mm, (Body diameter) 27mm, (Length) 198mm. Feature: 1. The W4 Pro is an upgraded version of the W4, a LEP flashlight with a throw distance of 3712yd The light intensity reaches 2,882,000 candela, and the luminous flux is 568 lumens. 2. High-efficiency drive circuit, no noise and no flicker. 3. With temperature control protection: When the temperature of the flashlight is too high, the flashlight will automatically reduce the brightness to prevent overheating. 4. With low voltage prompt function,  polarity protection, battery over-discharge protection. 5. It uses a 21700 rechargeable lithium-ion battery, uses a customized LEP light source, and then passes through the lens reflection system to form a dazzling beam. Two brightness modes, high and low, are easy to operate. 6. W4Pro has almost no spill, suitable for field search, sea rescue, long-distance indication, etc. It is specially designed for special lighting. Package included: 1 x W4 Pro LEP Flashlight. 1 x 5000mAh 21700 Battery.