The Holosun HS506 is a 30mm Reflex Sight created with your rifle or PDW in mind. With Shake Awake™, the user-programmable LED shut-off technology that wakes with the slightest movement, and you have one of the most battery efficient reflex sights on the market. Topping it off is T6 Aluminum housing and a multi-reticle system making this a must-have optic for any rifle or PDW. Features of the Holosun HS506MRS:2 MOA Dot; 2 MOA Dot & 65 MOA CircleUp to 50,000 Hours Battery Life (Setting 6)12 Brightness Setting: 10 DL & 2 NV CompatibleParallax-free & Unlimited Eye Relief1.535” Trox MountIn the Box: Cantilever MountT10 L KeyFlip-up Lens CapsCR2032 BatteryLens ClothUser Manual Holosun HS506 Multi-Reticle Circle Dot 30mm Reflex Sight w/ Shake Awake and Cantilever Mount - HS506