The Glo-toob is a multi-function, reusable light with hundreds of applications, both civilian and military. Waterproof to over 11,500 and virtually indestructible, Lithium Glo-toobs can take knocks and bumps in any environment. Glo-toobs are perfect for scuba diving only with the Twist On/Off Cap, 3500 Meters (11,000 Feet) , camping, road side emergencies, action sports or any extreme situation like covert Military operations. Its compact design allows you to easily carry it in your pocket, on your belt, or in a glove compartment.