BARSKA Red Micro GLX Laser Sight Lightweight and durable-Only 2-Inch in length Barska Optics Scrimshaw Sight Micro GLX Class IIIA Laser Product, 5mW power output Ideal for compact and sub-compact pistols with virtually no overhang The ambidextrous tap on/off button will not snag on anything when hoisted or carried in bag Built-in weaver standard compact mount means this laser virtually mounts on to any firearm with a weaver/Picatinny accessory rail Includes 1 CR-2 lithium battery