The RLS™ Light System flashlight features super bright LED technology, providing a very bright 190 lumens in a focused beam. Its prism reflector system penetrates light up to 350 feet. It is 1 in. in diameter and uses just three standard AAA batteries. It also has an approximate 2 hour runtime on high setting and uses a push button to control on-off illumination. The RLS Mount that houses the light provides a unique swing locking system that locks into position by swinging to the right or left and slides onto any compact light or Picatinny rail. Also includes an RLSM Duty Mount for attaching to 2 in. - 2.25 in. ( 50 mm - 58 mm) belts.