The Moray DSS-Pro uses a Xenon strobe that has nearly twice the burn time and is 30 percent brighter than competing strobes. Computer machined from a solid bar of Aluminum. This double O-ring sealed unit will run 30+ hours on a set of batteries and can be seen for miles at night. Double O-ring seals give this waterproof light an underwater depth rating of 1000 feet. Most importantly The DSS-Pro incorporates Moray's patented noisemaker device.