Exceptional brightness in a compact design The Sea Dragon Mini 1600 is compact enough to fit comfortably in your hand and also features long battery life, running for 4 hours with a 18650 rechargeable Li-ion 3500mAh battery at quarter power, or 1 hour at full power. The battery compartment also features an integrated safety pressure release valve. With a beam angle of 6° (4.5° underwater), the powerful 1600 lumen light is perfect for pointing out sea creatures at a distance, viewing in dark areas or crevices, getting your buddy’s attention or navigating a night dive.