The Bigblue TL-4000P EOS Back- or sidemount LED Aluminum Technical Light System delivers a stunning 4,000 lumens light output through 3 pieces of XML LED, and an 10 degree hot spot. The 6500K white light reflects the true vibrant colors of the surrounding while diving. 4 levels of brightness and SOS controlled by a reliable push button with battery indicator. BATCELLEOCANISTER rechargeable Li-ion battery pack comes with a smart charger enabling you to charge the battery in a few hours. The 4 steps power adjustment lets you choose between four output levels - IV at 100%, III at 50% , II at 25% or I at 10% extending the burn time and reducing reflections at close range. Replaceable Li ion rechargeable battery pack BATCELLEOCANISTER. Bigblue Protective case included. Up to 120 hours burn time.