TACFUN Tactical Reflex Stinger 4 MOA Red & Green Dot Sight Scope w/Cantilever Rail Durable all metal construction; Cantilever mount for any 20mm Picatinny or Weaver rails; Quick rail attachment design ; Allow for precision windage and elevation adjustments Red or green dual illuminated dot reticles with brightness control; Fog-poof, weatherproof, and shockproof; Removable spring loaded flip lens covers Obj. Aperture: 30 mm Magnification: 1x Field of View: 50 degrees Eye Relief: Unlimited Reticle Type: 4 MOA Finish: Black Matte Battery: 1 x CR2032 (included) Length: 5" Width: 2.55" Height: 2.7" Weight: 9.6 oz