(L1) will give you the light you need at work or at play.With its compact size and narrow penetrating beam, this secondary dive light tops the charts for international dive travel or can be used in a variety of industrial, fire or utility applications that require a lot of light, along with complete waterproof reliability. High brightness and extended battery life minimize need to change batteries Single handed switching with thumb or index finger LED will not breack when when dropped and lasts thousands of hours Equally great performance in and out of water for home or work Controlled output for constant brightness during battery life