The HWS excels in superior speed, extra wide field of view, the dual use reticle and rugged design. The HWS provides incredibly fast and accurate target acquisition under any lighting conditions, utilizes standard AA batteries and is submersible in water to a depth of 33 feet. The HWS 552 is the most popular night vision-compatible holographic weapon sight offered for GenI-III+ models. The AA battery is available globally making these models a favorite. The mount is compatible with both 1″ Weaver and MIL-STD-1913 rails. Features Auto Shut Down at 8 hours.