The Fenix PD10 is a high-tech, rugged tool that is perfect for any lighting application. It features three levels of output, which not only allows the user to select the best compromise between brightness and runtime for any given task, but also has ability to aid in an emergency. This small but mighty light features the following output levels: dim, regular, and high. On the low output level, the PD10 can provide an amazing 64 hrs of use on one battery. The PD10 does all this and still retains an incredibly compact size. If you"re looking for solid reliability, digitally regulated brightness, and compact size, this Fenix is for you.