This is the Tektite Mark-Lite Strobe High Intensity LED Strobe Light Emergency

Features:

• World's smallest submersible strobe! Now LED!
• Pocket-Size Emergency Strobe Beacon
• Depth Rating: 1,000 feet (300 m), IP68MDive Rated to 1,000 feet
• Bulb: High-Power LED strobe, 200+ lumens
• Bulb Life: 10,000+ hours
• Flash Rate: 2hz (2 times per second, 120/min.)
• Burn Time: 11+ hours on AA Alkaline
• Batteries: 1 AA Alkaline (included)
• CE (European Union compliant)
• Dimensions: 5.75 (15 cm) L x 1.2" (3 cm) Dia.
• Weight: 0.38 lbs. (0.17 kg)
• Made in the U.S.A. (complies with the "Buy American Act", may contain imported components).
• Lifetime Warranty

The Tektite Mark-Lite StrobeTM takes the best aspects of the Mark-LiteTM series and the M3 StrobeTM 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.