Beacon complies with all USCG requirements for Night Visual Distress Signals as found in the Code of Federal Regulations: 46 CFR 161.013. Flag complies with USCG Requirements in 33 CFR 175.130 for daytime signaling.Flashes bright SOS Distress Signal in Morse Code Duration: flashes 2 times longer than USCG continuous run-time requirementBrightness Maintains constant light intensity 2.5 times longer than USCG requirement.Low Battery Indicator Function when turned on unit will quickflash for 5 seconds if batteries need replacingMultiple Deployment Options Floatable self-righting design, Handheld with molded in plastic grips, Hang with provided lanyardsWaterproof easy and intuitive on/off switchRequires 2 D-cell batteries (not included)SOLAS grade reflective tape at waterlineSpecificationsItem Number: 547Weight: 2 lbDimensions: 5.5 x 13