BSA 635nm Red Laser Sight with Metal Housing and Both 3/8" and 5/8" Adjustable Rail Mounts: * Features: * Black matte finish * 22-rail, Weaver-style base * Adjustable for windage and elevation * Momentary pressure switch * Visible range: 50 yds (indoor lit) * Visible range: 100 yds (outdoor night) * Dot size: 11.3mm at 10 yds * Output power: 3-5mW * Wave length: 635nm * Focus range: 2mm-0 * Laser class: 3R * Requires three 1.5V LR44 batteries (included) * Hex wrench set and instruction manual also included * Weight: 0.23 oz * Dimensions: 5.5"L x 1.6"W x 6.2"H * Model# LS635