Underwater Kinetics Aqualite Video 90degree, Black Variable Power: The brightness can be stepped up from 120 to 600 lumens in 4 levels (Full, 1/2, 1/3 and 1/6) using the rear power dial. Wide Angle Beam: 90 Lamp Head Covers the area seen by most wide angle cameras (ex. GoPro). Rechargeable: Power is supplied by a lithium ion battery, which is charged from any USB power outlet or the included wall socket adapter. An additional battery is also included. (DO NOT use disposable 123 lithium cells). Waterproof to 150 m