The Bigblue TL-5200P LED Aluminum Technical Light System delivers a stunning 5,200 lumens light output through 4 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. The 18650 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 18650 Li ion rechargeable battery pack BATCELL18650X4. Lanyard included.