Docter Red Dot Sight 1X30mm Scope Holographic 11mm & 20mm Weaver Rail Mount for Tactical Hunting Optics 5-0040

"Product parameters
Explanation:
11 brightness adjustment red dot sight
Sturdy metal construction
Multi-optic lens
Brightness, wind direction and precise elevation settings
Integrated mounting for 20mm and 11mm rails
Magnification: 1 x
Objective lens diameter (mm): 30
Exit pupil distance (mm): 30
Vision @ 100 yards: 68
Optimal vision (inches): unlimited
Parallax setting: 50 yards!
Size: as shown
Weight: 210g
Power supply: CR2032 battery (not included)
"