This rugged water light produces brilliant strobe flashes automatically when thrown overboard and is visible for miles at sea. When used with a 6 volt alkaline lantern battery (not included) it will flash at the U.S.C.G. required rate for over 52 hours and will still flash at least every 2 seconds after 7 days of continuous operation. Meets U.S.C.G. requirements (46 CFR-161.010). Recent intense technological developments in the camera industry enable Forespar to bring you this advanced strobe light at a significantly lower price. The stainless steel mounting bracket is included. U.S.C.G. Approval # 161.010/20/0.