Feature : 4* CREE XML2 LEDs, max 2500lumens, powerful enough to be used as a primary light Side magnet switch, which makes this light easy to operate underwater Three different brightness level, High-Medium-Low, meets different brightness needs underwater Hidden Strobe setting, long-press the switch for 3s, the strobe setting will be activated. Short press one time, the brightness level will back to ND51 will be activated. Short press one time, the brightness level will back to the previous brightness Powered by 26650Li-ion battery, max runtimes about 11hrs at 300lumens With a big tail, can be equipped with a different mounting system. Packing list : ND51 dive light * 1 O-ring * 2 26650 battery *1 Charger *1