This is the Princeton Tec Aqua Strobe LED Scuba Diving Strobe Light Features: POWER: 100 Lumens LAMP: 1 White Maxbright LED (flashing) BURN TIME: 12 hours BATTERIES: 1 AA AlkalineWEIGHT3.3oz / 96g WATER RESISTANT: IPX8 WARRANTY: 1 Years The Aqua Strobe LED promises to grab attention when activated, wherever you are. A single AA battery fuels the strobe. A simple twist operation turns the Aqua Strobe LED on and also helps to prevent accidental activation and produces 60 flashes per minute. A buoyant cone keeps the light pointed up whether found underwater or at the surface. The Aqua Strobe LED can attach to your BC, tank, or anchor line, as well as a PFD or pack and comes with both a Velcro strap and lanyard.