Divemaster Strobe Light
Waterproof to 50 meters, the SL15 Strobe Light is a good choice for boaters and divers. It's also a useful light to have in the trunk of your car for that unexpected nighttime breakdown. Continuous flashing for 8 hours. Visible for 2 miles (On clear night). Velcro arm strap included. Takes 1.5v, C type alkaline battery.