Featuring a small solar panel that kicks in if the battery fails, the Holosun Solar-Charging Rifle Sight will help you get on target quickly. A parallax-free tube sight with unlimited eye relief, the SCRS employs a green 2 MOA dot and 65 MOA circle reticle with 12 brightness settings, four of them night-vision compatible, that can be selected manually or automatically based on ambient light. The sight uses shake awake activation and shuts off automatically after being motionless for 10 minutes. The reticle has a 100 MOA adjustment range at 1 MOA per click. The sight comes with a 1.63" lower 1/3 co-witness mount for Picatinny rails; the mount is removable, and the optic&';s interface is the same as the Holosun HE509T or compatible third-party models. Solar panel provides backup power in event of battery failure when natural or artificial light is available "Shake awake" auto startup and auto shutdown after 10 minutes of inactivity Parallax-free, unlimited eye relief Reticle adjusts at 1 MOA per click, 100 MOA total adjustment range Lower 1/3 co-witness mount for Picatinny rail Same optic footprint as Holosun HE509T Key Features 20mm Tube Sight Solar Failsafe Battery Backup 12 Brightness Settings (4 NV-Compatible) Auto or Manual Brightness Selection Shake Awake 10-Minute Auto Shutoff 100 MOA Adjustment, 1 MOA per Click Parallax-Free Unlimited Eye Relief In the Box Holosun Solar-Charging Rifle Sight (Green 2 MOA Dot & 65 MOA Circle Reticle) Lower 1/3 Co-Witness Mount Rubber Cover T10 L Key Lens Cloth CR2032 Battery Limited Lifetime Warranty Limited 10-Year Manufacturer Warranty (on Illumination System)