Light output is 3 Watt's/250 Lumens with Cree XPE LED bulb. The light is rated to 300 ft and made with a polycarbonate case. 4 hours on high power using 3 AAA Alkaline batteries. Twisting the light head on and off cycles the light through full power, low power, & flash.  This light is a must for every diver and is a perfect pocket/back-up light.