For those that have vision constraints or where a red dot is not easily visible in an outdoor setting the Green Matchdot ll solves the problem! The new and improved sight has 4 dot sizes (246 and 8 MOA) plus two reticle patterns for added flexibility. Elevation adjustments can be made ''on the fly'' with our Bullet Drop Compensator knob and black matte finish is as rugged as it looks. The following accessories are included: Mounting Rings Bungee Lens Covers Tube Extension Hex Wrench Polarizing Filter and Battery. - Tube Diameter: 30mm (1.2 inches) - Windage/Elevation Adjustments: 1 MOA per click - Dot Size: 2 4 6 8 MOA / 2 Reticles - Dot Brightness Adjustment: 11 Settings / Click - Field of View: Unlimited - Length: 138mm (5.1 Inches) - Battery: 3v Lithium CR2032 - Battery Life: User dependent - Weight: 150g (5.1oz) - Parallax Free @ 50m (55 yards)