The black Bigblue BB4x5 LED Primary Dive Light has a double o-ring waterproof seal and a depth rating of 328'. It features a single Cree LED that outputs a maximum of 750 lumens at an even beam angle of 40°. The light's 6500K color temperature is approximately that of daylight. A magnetic switch allows for output adjustment, providing high (100%) and low (70%) power options. Burn time ranges from 3-5 hr with AA batteries and 9-40 hr with C batteries, depending upon output level. AA and C battery adapters are included. The body of the light is constructed from durable polycarbonate and the lens is made of tempered optical glass.