UST See-Me Waterproof LED Light &amp; Strobe<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Provides 20 lumens of 360-degree light for up to 17 hours; ideal as a personal locator light for boating， camping， backpacking， hunting， and more</li><li>Visible up to 3.4 miles (5.5 km) on a dark， clear night; exceeds US Coast Guard (USCG) requirements of 1 nautical mile (1.9 km) visibility</li><li>Waterproof IPX7 rating (protected against water immersion for 30 minutes at 1 meter); easy twist on/off control</li><li>Lifetime bulb never needs replacing; includes lanyard cord and hook-and-loop strap</li><li>Powered by 2 readily available AAA batteries (not included); measures 4.95 x 1 inches (126 x 25 mm) and weighs 1.8 ounces (51 grams) with batteries</li></ul></div><img src="http://ecx.images-amazon.com/images/I/416QFsvFzeL.jpg" noproxy>