The Holosun Enclosed Pistol Sight (EPS) is designed for use on Full-Sized pistols. The Holosun EPS features an extremely low deck height, allowing for the use of standard iron sights for backup on some pistol models. The mounting footprint is the same as the HS407K X2 and HS507K X2 models, with low indexing lugs, thus facilitating the IPX8 waterproof rating and low height over bore. Other key features include up to 50,000 hours of battery life, and Holosun's Shake Awake Sensor. The EPS will include a 507C adapter plate for use with any industry standard 507C cut slide as well as one CR1620 lithium battery. FeaturesUp to 50,000 hours of battery lifeK FootprintShake AwakeIPX8 Waterproof(1) CR1620 Battery (No Sight Removal Needed for Replacement)Adapter PlateMulti Tool Lens ClothUser Manual