ohhunt® RD U3 Large Window 3 MOA Shake Awake Red Dot Sight with RMSc Footprint and Picatinny Mount Flashlight Laser Ring Tube Diameter(mm/inch): 30/1

Tube Diameter(mm/inch): 30/1

Field of View (ft@100yds) : 28

Three kinds of eyepiece caliber to choose

Steel recoil key

ohhunt® RD U3 Large Window 3 MOA Shake Awake Red Dot Sight with RMSc Footprint and Picatinny Mount Flashlight Laser Ring Tube Diameter(mm/inch): 30/1Shake Awake: It will automatically enter a dormant state after 2 minutes of non use,As soon as the sight senses motion, it will instantaneously wake up . you don't have to worry about turning it on or forgetting to turn it off. If the sight is manually powered off, the shake awake function will be turned off simultaneously. Side Loading Battery Compartment: no longer necessary to remove sight (allowing for quick battery replacement)and re zero. IPX7