Parallax-free aiming with a single, bright glowing red dot; proven to be the fastest, most accurate sighting system available. Exclusive Advanced Circuit Efficiency Technology (ACET) greatly improves the useable life of the single 3-volt battery. ACET sights can last nearly 50,000 hours (over five years on setting 7 out of 10) of constant use. AA battery model can last up to 80,000 hours with a single battery. All sight housings are machined, or extruded from 6000 series aluminum for maximum strength. Lens surfaces are optically ground (not cast) for superior clarity. Proprietary housing and lens sealing material keeps electronic and lens surfaces dry, fog-free and fully functional regardless of weather conditions. All models feature non-reflective, Mil-Spec anodized finishes. The latest civilian version of the U.S. Army’s M68 CCO (Close Combat Optic), and the most advanced sight produced by Aimpoint. Super efficient electronics deliver up to eight years of continuous use from a single AA battery. Optics feature band pass objective lens coating for superb light transmission and optimum 3rd generation NVD compatibility. Newly improved rotary brightness switch provides 7 NVD settings and 9 daylight settings, plus one extra-bright setting for outdoor use with anti-reflective goggles. Excellent choice for varmint hunters needing a rugged red dot optic with low light capabilities. Available with versatile 2MOA dot. Can be quickly converted to a 3X, long-range red dot reticle scope by installing the optional Aimpoint 3XMag magnifying module listed below. COMPM4S has the same great operating features as the COMPM4, but positions the battery compartment low, on the right side of the unit for less chance of snagging and improved view over the top of the optic.