AimPoint 4 Minute of Angle CompML3 Sight Innovative sight with Advanced Circuit Efficiency Technology (ACET) provides battery life of up to five years Comes with replaceable outer black rubber cover, which protects it from scratching and improves stealth Unlimited field of view and optimal light transmission; parallax-free with unlimited eye relief; no harmful laser emissions ACET technology allows 50,000 hours of operation on single battery; submersible to 150 feet Includes limited manufacturer's warranties of two years for professional or competitive use, and ten years for personal or recreational use