SPINA OPTICS FC1 holographic sight for 20mm rail

Principal: Collimated Prismatic Sight
Dot size: 2 MOA
Eye relief: Unlimited
Lens size: 15 X 21 mm
Magnification: 1X / No Magnification
Battery: CR2032 3V Lithium Battery (not included)
Brightness levels: 7 Night Vision, 7 Daytime, 14 levels
Battery life: 8654 Hours (at DT Level #3)
Temperature range: -32℃ ~ 60℃ (-25℉ ~ 140℉)
Length/Width/Height: 50 x 35 x 40 mm (W/O Mount)
Night vision compatible: Yes
Weight: 170g