The Bigblue TL-9000P LED Aluminum Technical Light System is designed to deliver a stunning output of 9,000 lumens of light through eight pieces of LED, with a 10-degree hot spot. The 6500K white light reflects the vibrant colors of the surrounding underwater environment. This powerful technical light system offers four levels of brightness, as well as an SOS mode, that can be controlled by a reliable push button that comes with a battery indicator. The 18650x7 rechargeable Li-ion battery pack is included, along with a smart charger, which enables you to charge the battery in just a few hours. With the four-step power adjustment, you have the flexibility to choose between four output levels - IV at 100%, III at 50%, II at 25% or I at 10%, extending the burn time up to 20 hours and reducing reflections at close range. The battery pack is replaceable and comes with a Lanyard. The pack is made of Li-ion rechargeable battery cells BATCELL 18650x7.