Ultimate Arms Gear tactical red laser sight with weaver/picatinny style mount . Illuminated dot visible up to 300 yards in darkness. Simple Sliding on/off switch , Wavelength: 625/660nm , Output Power: <5MW , Operating Temperature: 14 F - 113 F , Battery:3 x LR44 (included), Weight: 2.1oz , Dimensions: 2.25 inch(L) x 1.154 inch(W) x 0.973 inch(H) , Windage & Elevation: External Adjustments, Material: Lightweight & Sturdy Precision Machined Aircraft Aluminum, Color: Matte Black