The Holosun HE403B-GR is a green dot sight made by holosun. This optic features a 2 center moa dot with an amazing 50,000 hours of battery life 25,000 hours of battery life when you are in setting 10. This optic features motion sensors which is great for battery retention as well as also having a memory function for the brightness settings. This optic comes with 10 daylight settings and 2 night vision settings when you are in manual mode.On the right side of the optic is the battery compartment and on the top and right side of the optic is the turret&';s adjustments for the reticle. This optic is waterproof and well as also being parallax free. Included in the kit is the user manual, lens cleaning cloth, tools for installation, a battery, spare battery tray, the low mount as well as covers for the lenses. In the Box Lower 1/3 Cowitness Mount Low Profile Mount T10 L Key Rubber Cover User Manual CR2032 Battery Lens Cloth