Underwater Kinetics Super Q eLED Rechargeable Lithium Ion Dive Light Proprietary compound paths optics permit high efficiency and compact size Beam produces a bright spot with almost no peripheral light for improved visibility in murky water Powered by rechargeable lithium ion battery or in an emergency 2 optional 123-type lithium batteries Universal 90-240 VAC, 50-60 Hz USB power supply and USB powered charging cradle included Energy conservation design transfers heat back into batteries for longer burn time and improved cold weather performance