Compatible with every generation of NVD; ACET technology allows up to 80,000 hours (over 8 years) of daytime operation on one AA battery; Internal voltage regulator allows the CompM4 to be used with any AA size battery; 7 NVD settings and 9 daylight settings; QRP2 mount has twice the clamping force of the original QRP, and the mounting knob is wider and shorter to improve operation and lower the risk of snagging on other gear; 500,000 hours of use on NVD setting; 2 MOA dot for close combat and long distance engagement; Matches perfectly with Aimpoint 3xMag; Submersible to 150 feet (45 meters); Mechanical switch for speed and reliability