The SM-3 is a high intensity LED strobe which provides 360° visibility for approximately 2 miles. This compact yet durable marker light facilitates rescue by automatically activating and beginning to strobe when in the water, working for over 40 hours at 30oC (86oF) or over 24 hours at -1oC (30oF). Perfect for commercial marine, petro-marine, cruisers, and any other application needing a reliable Crew Overboard Marker (COB) light, the SM-3 floats upright in all conditions, ensuring it will keep shining when you need it the most. Bright light in all directions (360° visibility) UV resistant polycarbonate case Lightweight and compact in size Easy bracket installation The bracket is included and maintains same hole pattern as SM-2 for easy retrofit Automatically rights itself and activates when in the water High intensity LED strobe Floats upright in all conditions Minimum 40 hours continuous operating life at 30oC (86oF) or over 24 hours at -1oC (30oF) User-Replaceable AA Energizer L91 Lithium Batteries (Not Included)