Shot after shot the S-TAC 1-7x24mm Illuminated Mil-Hash meets the demands of tactical shooters. Built with performance in mind, offering aspherical lenses for superior edge to edge clarity, a long eye relief and a rugged 30mm one-piece main tube. Take aim knowing you can mount any situation at hand. Fast focus eyebell allows for quick and easy adjustment when in the field Resettable low profile tactical knob Low profile wide turrets with .1 MRAD adjustments Illuminated Rheostat designed for low light shooting applications the 11 position Rheostat illuminates the center dot to allow quick target acquisition Uses a CR2032 battery and has easy off mode between Mfg: Sightron