The ultimate in underwater illumination technology. Four LEDs are enclosed in a waterproof/environmentally sealed stainless steel housing three inches long and one inch in diameter. It weighs only 3.5oz (125g), ~1oz in water, so it can be comfortably mounted on a mask strap for hands free operation. Simple twist of rear bezel activates the light using a magnetic reed switch.

Puts out enough light for survey work, camera operation, or to safely guide you out of the cave in the case of primary light failure.