The Tektite Mark III 4-LED steady on (i.e. non-strobe) submersible marker light is double O-ring sealed, depth rated to { 1000 ft | 300 m }, and with four LEDs is the brightest marker light available providing 50+ hours on three AA-size alkaline batteries. Features durable military tough ABS and LEXAN® construction, twist on switch with non-slip grip, { 9.8 in | 25 cm } long safety orange color body and clear { 1.2 in | 3.0 cm } wide lens with sturdy attachment point for snap or lanyard. A bungee strap is included, along with a limited LIFETIME Warranty from TekTite.