Manual Activation; Facilitates Rescue By Emitting The Flash Characteristic For The International Morse Code For SOS; LED Flashlight; For Use With Boats Up To 65 Feet; 20 Hours Operational Life; 2.36 Inch Diameter x 8.07 Inch Height; IP67 Waterproof; USCG/ CE Certified; With Distress Flag; Works With 2 C Cell Alkaline Batteries(Sold Separately)