Holosun HS403B Micro Red Dot Optic (2 MOA) 50, 000 Hours of battery life (that's over 5 years of continuous use) motion awake with 8 hour auto shutoff Parallax-free, when the red dot is on the target, so are you High quality clear lens with crisp, bright red dot High strength aluminum, Mao finish, the glass is supposed to be at an angle and not flush with the bezel Unit will "auto wake" when vibration is detected