Innovative Scuba Concepts LT0525 Multi Function Glo-Toob AAA Waterproof Emergency Dive Light These remarkable, solid "cylinders of light" utilize Super high bright LED, measure approximately 2-3/4" high by 3" diameter and are waterproof rated to 3500 meters. They come in 5 different colors The glow-toob dive light is the world`s toughest, brightest, and smallest emergency light marker. It's so powerful that it can be seen from over 1 mile away Powered by a 12V (23a) Alkaline battery (included). battery life is 30-80 hours depending upon 7 different light modes: flash, fast strobe, slow strobe, SOS, throb, 100% constant on, 25% constant on Lasts 30-80 hours on single AAA battery. Functions of the multi-function include flash, fast strobe, slow strobe, constant-on, SOS, 100%, and 25% Multi function fx LT0525