Clipped to your body or gear, the Aqua Strobe is sure to get the attention of emergency services. Floats head up in water. Bulb: High Efficiency Xenon flash tube (70 flashes/min) Batteries: 1 AA Alkaline (included) Burn Time: 8 hrs. Waterproof up to 100 m. Weight: 3.4 oz. w/battery Includes velcro strap and lanyard