Don't risk your life with a cheap strobe. Put this on your tank for night dives and they will see you underwater every time. The Tektite M3 LED Strobe is a new multifunction strobe with a flashing or steady light mode. Use steady mode as a backup light or area light. Turn on the light. If it is not in the mode you want, quickly turn it off/on to change modes. The Tektite M3 Strobe takes the best aspects of Tektites Mark III series and Strobe 3500 to create a thin, rugged, powerful LED strobe. Its high-intensity LED strobe produces comparable light output to larger Xenon strobes without a fragile glass strobe tube to break. This LED strobe is crafted from durable ABS and Lexan, is double O-ring sealed, waterproof, and has a depth rating of 1,000' (300 meters). It will run for over 100+ hours in flashing mode or 20 hours in steady mode on 3 AA-size alkaline batteries (included) and has a lamp life of 10,000+ hours. Light has a twist on, rotary switch, measures (L x Dia.) 9.75" x 1.2" (24.77 cm x 3 cm), and weighs 8 oz. (226.8 g). Light comes with a hook and loop strap is available in multiple colors and is made in the USA.