The Micro GLX Green Laser Sight by Barska is the ideal aiming accessory for compact and sub-compact pistols. This laser sight features an ambidextrous tap on/off button and its low-profile design ensures that this laser sight will not snag when being withdrawn from a holster. It is only 2 inches in length and comes with a built-in weaver compact mount. Included is one CR-2 Lithium battery.