Check the listing for details. Compact Adjustable Red Dot Laser sight with Mount for 20mm Picatinny-11mm Rails. Color: Black, Condition: New. Listed at 10.95 USD. Compact Red Laser Sight with 20mm/11mm Rail Mount Features ---Solid all metal construction ---Compact design, easy to attach to existing sights and optics ---Windage and elevation adjustable (tool included) ---Mounts included for 20mm Picatinny / Weaver or 11mm Dovetail rails ---Easy to install with the included tool ---The laser is powered by three AG13 coin batteries. Six AG13 batteries are included for your convenience Specifications ---Dimensions: 3" (Length) x 1" (width) ---Height: 1.4" with 11mm mount; 1.6" with 20mm mount ---Weight: 3.0 OZ ---Power: 2mw ---Wavelength: 650 nm ---Reaching Distance: 100m ---Color: Black ---Power: 3 x AG13 (included) Items Included ---One (1) compact red laser sight ---Two (2) Allen wrenches ---Six (6) AG13 batteries.