Maintains brightness throughout the battery life. Using the dovetail handle attachment either pistol or lantern grips can be attached as well as a photo arm. Features: A pair of water cooled high intensity LEDs delivering over 10 watts of power; High color temperature gives the beam the same color as sunlight; Brightness remains even higher underwater than in air with UK's unique LED water cooling design; Full (825 lumens) and half-power (530 lumens) switch can extend battery life even more; Power circuit control maintains almost contant brightness with alkaline or rechargeable batteries; Locking switch; Front lens protected by heavy rubber boot for drop protection; Tough, non-corroding ABS and polycarbonate plastic construction. Rubber sleeve lanyard included. Powered by disposable alkaline batteries or rechargeable UK NiCad Upgrade kit. Also uses individual NiCad or NiMH C-size batteries. Light measures 7.3 in x 7.1 in x 3.2 in.