The Best Strobe Anywhere! Our Xenon strobe has nearly twice the burn time and is 30% brighter than competing strobes. Used by scuba divers, military and fire fighters worldwide. This double O-ring sealed unit will run 30+ hours on a set of batteries and can be seen for miles at night. Optional colored lenses, including infrared (IR), are available and a Velcro strap is included. Specifications: Depth Rating: 500 feet (150 m) Bulb: Xenon strobe Bulb Life: 1,000,000+ flashes Burn Time: 30+ hours Batteries: 2 C-cell Alkaline Weight: 0.75 lbs. (0.34 kg) Dimensions: 7.25" (18 cm) L x 1.9" (5 cm) Dia