LaserMax UNI-Max Essential Series Red Laser is smaller than a matchbox and incredibly lightweight - only 1oz. with batteries. The LaserMax UNI-Max Rail-Mounted Laser Sight is an advanced targeting system which features a patent pending integral mounting rail that allows the user to add other rail mounted accessories below the laser sight, such as a tactical light or infra red laser. This unique feature allows the LaserMax Uni-Max Laser Sights to be used on a rifle scope or a pump shotgun, "sandwiched" between a gun and a flashlight and even mounted on binoculars or telescopes! This LaserMax laser sight quickly and securely attaches to any Picatinny or Weaver Style Rail, allowing for multi-use between pistol and long gun platforms. The Laser Sight can be activated with the left or right hand, or with optional LaserMax Unimax Momentary Activation Switch. It also features an adjustable windage and elevation settings for precise alignment and it maintains zero after every battery change. To avoid unintentional battery drain, it is set to turn off after 30 minutes of constant use. While in the time-out mode, simply cycle the activation switch off to refresh the laser and turn it back on.