Powerful 1600 lumen LED dive light using the latest Luminus SFT-40 LED; Includes lanyard with BCD Clip, 3500 mAh rechargeable 18650 Li-Battery, 18650 USB Battery Charger; 6 deg. narrow beam angle (4.5 deg. underwater) for long range and for pointing out sea life; One button operation - Long push (1 sec) to power on/off; Short push to cycle through 5 light modes; Easily adjust between five light modes; Color battery indicator displays real-time charge levels; Safety pressure release valve relieves internal pressure build up caused by damaged battery; Depth tested to 330 feet/100 meters; Battery: one (1) 18650 Li-Ion rechargeable battery 3500 included, optional 4000mAh battery available; Instant-ON mode: Enabling Instant-ON, allows the light to be instantly powered on/off by pushing the power button