Having the Holosun HE403B Elite Green Dot Micro Sight on your go-to firearm is the first step toward building an entire platform that incorporates the latest and greatest in cutting-edge firearm and optics technology. The Holosun HE403B Elite Green Dot Micro Sight is built with all-new Green LED electronics, quadrupling the efficiency at higher settings and providing a battery life of up to five years on a single CR2032 battery. The optic also features the company's "Shake Awake" technology to conserve battery life. Each Holosun HE403B Elite Green Dot Micro Sight ships with a low mount and a 1/3 co-witness mount and provides users with an easy-use 2 MOA dot. Fi Mfg: Holosun