The slim, lightweight design keeps it out of the way until needed, and the supplied C-Clip adapter for life jackets grips snugly around most oral inflation tubes. The intense strobe light is visible up to 2 miles (3.2 km). The waterproof and corrosion resistant case features a new attachment pin that engages the top cap, thereby preventing accidental disassembly. It's designed to meet the demands of marine service, and is ideal for car, boat crew, campers, crisis or whenever a reliable efficient light is needed. The slim, lightweight design comes with steel clip and adjustable Velcro strap, and can be mounted on bicycle frame, pole, etc. It has more than 8 hours continuous operation and is covered by a 1 year warranty. 6-Inch long, 1.6-Inch diameter, 2.6 oz. Requires 2 AA batteries (not included).