Underwater Kinetics Super Q Dive LighteLED Rechargeable Dive Light. 4 1 2" overall. Yellow and black high impact ABS construction. Up to 90 lumen output. Waterproof to 500 ft. Powered by rechargeable lithium ion battery or in an emergency uses two 123 type lithium batteries. (Rechargeable battery and universal 90 240 VAC, 50 60 Hz USB power supply and USB powered charging cradle included). Burns up to 4 hours before recharging. Energy conservation design transfers heat back into batteries