Dagger Defense DD30M3 Red Dot Reflex Sight Scope- Reflex Sight Optic and Substitute for Holographic red dot Sights Mounts on 20mm weaver or picatinny rails Not a magnified scope Length: 5.12" / 130mm Width: 2.56" / 65mm Height: 2.75" / 70mm 1 x CR2032 battery 5 Levels Dot Brightness Control on each illuminate color Mounts on 20mm weaver or picatinny rails Not magnified Length: 5.12&#034; / 130mm Width: 2.56&#034; / 65mm Height: 2.75&#034; / 70mm 1 x CR2032 battery 5 Levels Dot Brightness Control on each illuminate color