The AMERIGLO Haven is designed for everyday reliability" for everyday carry" in any environment. Defending your family and your home requires 24/7 reliability" immediate target acquisition" intuitive controls" and innovative electronics you can trust to work every time. Also" the HAVEN is guaranteed to survive continuous firing and recoil from today's harshest handguns and is compatible with today's most common IWB/OWB holsters. Ready for immediate install on today's most popular optics-ready pistols" the HAVEN uses the Trijicon RMR footprint. Its smart electronics offer a 12-hour runtime followed by a 12-hour" motion-activated auto-on. 2-year battery life on a mid-setting with a common CR2032 battery.