The emergency strobe is a small lightweight, personal battery powered (1-D cell not included) light that has a powerful 7500 volt light beacon visible for up to three miles depending on weather. USCG and SOLAS approved. The xenon flash tube flashed 60 to 70 times per minute for up to 16 hours, and then continues at a slower rate for 60 plus hours. High impact waterproof case can easily be attached by its built-in stainless steel locking pin. Optional magnetic base is available. Shipped with clear lens. Weight 4 oz. (116 g). Made in the U.S.A.