The Classic, Often Imitated Scuba Diving LightnIdeal Multipurpose Light For Both Experienced And Novice DiversnNarrow Beam Is Suitable For Both Night And Day ExplorationnIncludes Halogen And Long Burn BulbsnThe old faithful of Princeton Tec's dive line, the TEC 400's classic and rugged design has been a staple in the dive industry for decades. 4 C-Cell (included) batteries power the clean halogen bulb for up to 5 hours of underwater light with an adjustable burn time. They say you can't teach an old dog new tricks", but with a light as reliable as the TEC 400, why would you want to? The Halogen lamp provides 49 lumens of brightness and the simple thumb switch makes one hand operation a snap. Light has a visible light distance on land in high output mode of 548' (167 meters) and in low output mode 438.3' (133.6 meters). Light comes with an adjustable rubber sleeved wrist lanyard and an additional long burn bulb. The Tec 400 Flashlight is made from high impact resistant polycarbonate plastic, weighs 19.97 oz. (566 g) with batteries, is depth rated to 330' (100 meters) IPX8, is available in multiple color choices and comes with an owner's manual.