Automatic brightness sensor adjusts brightness to match the environmental conditions; also has 3 manual brightness settings
Battery access is conveniently located on the top of the sight; automatic time-out feature after 8 hours helps battery last up to 5 years
Available with Picatinny/Weaver mount for mounting on rifles, handguns and tactical shotguns
Available with No Mount, which allows you to match it with the perfect mount for your use, whether it's sidearm, co-witness on an optic like a, shotgun, or even the Burris Spotting scope. See a full ist of mounts here.
Generally speaking, the 8 MOA dot is most popular for short range shooters, especially with handguns or shotguns. The larger dot makes target acquisition quicker.