The Tektite Mark-Lite Strobe takes the best aspects of the Mark-Lite series and the M3 Strobe to create a compact, high-intensity LED strobe that is perfect for emergency location marking use. This compact LED strobe is crafted from durable ABS and LEXAN, is double O-ring sealed, waterproof, and has a depth rating of 1,000 feet (333 m). This personal-sized LED strobe will operate for 11+ hours on 1 AA Alkaline battery (included). Military issue tough, as used by US/NATO. Use it for diving, fire fighting, mountain climbing, or emergency marine use. Visible for more than 2 miles at night at the surface (conditions permitting). Available in a variety of lens and body colors. Includes battery and a Velcro strap. An infrared (IR) version is also available for approved government and military organizations.