The Compact Green laser is an ultra bright and powerful green laser in a much smaller package than was available previously. Green Laser: Freq. 532nm, Class IIIa Laser. Maximum Output: <5mw. Quick Release Weaver Style Mount. Fully Adjustable for Windage and Elevation. Includes adjustment tool. Ambidextrous Sliding On/Off Switch. All Aluminum Construction. Black Anaodized finish. Uses 1 CR2 Lithium Type Battery (Included). Dimensions: 2.6" L x 1.0" W x 1.6" H. Weight: 3.3 oz.