The Glo-toob is a multi-function reusable light with hundreds of applications both civilian and military. Waterproof to over 11500 and virtually indestructible Lithium Glo-toobs can take knocks and bumps in any environment. Glo-toobs are perfect for scuba camping road side emergencies action sports or any extreme situation like covert Military operations. Itspact design allows you to easily carry it in your pocket on your belt or in a glovepartment.FEATURES Virtually indestructible: 1 Powered by inexpensive Lithium battery: 2 Weighs only 2.18 ounces: 3 360 degree viewing angle: 4 Nitrile O-ring seal: 5 3.75 in. x 0.95 in. (80mm x 24mm): 6ATTRIBUTES Batteries: Yes Burn Time: 100000 Hrs Carry System: Lanyard Power Source: CR123A Lithium Battery Special Features: Virtually Indestructable. Limited Lifetime Warranty. Submersible: Yes Switch: Twist Cap Usage: 40 Hr.