Stay safe, stay visible with the Emergency Strobe. Compact, lightweight and durable, with a waterproof case and shatter-resistant lens cover. Bright, too - 300,000 candle power!Small and lightweight. Flashes 50-60 times per minute for up to 16 hours; continues at a diminishing rate for up to 40 additional hours. Visibility range up to 3 miles. 300,000 candle power. Sealed magnetic sliding on/off switch. Waterproof case with shatter resistant acrylic lens cover. Side offset locking pin lets you attach strobe to PFD, backpack or belt, for quick response access. Uses one 'D' cell alkaline battery (not included). USCG and SOLAS approved. Wt. 3oz. (without battery).