The Aimpoint CompM4s was designed for users who require a professional quality red dot optic for use under extremely harsh conditions. The CompM4s features a low battery compartment and the high strength aluminum alloy housing is coated with a non-reflective hard-anodized finish. The sight is completely sealed against the elements and is submersible to 150 feet. The 2 MOA red dot reticle allows for enhanced speed on target. The CompM4 comes equipped with a killFlash anti-reflection device and black rubber bikini-style rubber lens covers. Works up to 80,000 hours (over 8 years) of daytime operation using one AA battery and 500,000 hours with a single AA battery. Electronically regulated to allow use of any AA size battery available worldwide. Features absolute co-witness with iron sights. Operationally parallax free, threaded front lens opening allows for use with screw-in anti-reflection device (ARD).