AIM FC1 Red Dot Sight 2 MOA Reflex Sight 1x Holographic Sight (Dark Earth)

AIM FC1 Red Dot Sight 2 MOA Reflex Sight 1x Holographic Sight (Dark Earth) Fit to Mount on 20mm Picatinny Rail System Handguard 2 MOA Dot Size Power by CR2032 Battery Adjustable 7 Brightness Level Power on: Push the button while the sight is turned off Power off: Push the button for 3 seconds or auto shut off after no operation in 2 hours Brightness level change: One level lowered per each push Temperature range: -32℃ ~ 60℃ (-25℉ ~ 140℉)