This is Tektite&';s Mark III Strobe marker LED lightThis Super light features: Depth Rating: 1,000 feet (300 m), IP68M Lamp: 2 LED Lamp Life: 10,000+ hours Burn Time: 40+ hours at full power then up to 160 additional hours of usable light Batteries: 3 AA Alkaline (included) CE (European Union compliant) Materials: ABS and LEXANA(R) Dimensions: 9.75" (25 cm) L x 1.2" (3 cm) Dia. Weight: 0.48 lbs. (0.22 kg) U.S. patent #6,168,288 (expired) Made in the U.S.A. (complies with the "Buy American Act", may contain imported components). Lifetime Warranty The Mark III(TM) Strobe, solid-state strobe technology. It&';s LED flashes for 300+ hours on 3 AA batteries. In addition the LED lamp is rated for more than 10,000 hours. Available with your choice of lens colors. Lens color is permanent. A Velcro strap is included.