HOLOSUN HS403A Micro Red Dot Sight (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. Fully waterproof and submersible to 100 feet Kindly refer the user manual attached below for troubleshooting steps and instructions.