Seattle Sports Hydrostar SOS SeaStar Green, This full-function light is a great addition for any paddler or boater, offering everything you need for lighting in one compact, waterproof package,Use the flashlight setting for shore landings at night or as a 360º viewable white light for paddling, Switch to a red, green setting to use as an auxillary boating light or switch to the super bright 1 watt LED strobe or S O S signal for emergency use, An integrated clip allows for quick attachment to a PFD; a safety whistle is built in to the lanyard snap hook and the base of the light is magnetic for additional mounting options, 3 AAA batteries included, Specifications, Height 6", Unmounted Height 5", Weight 8 oz,