The latest upgrade to the Folding Sight adds an easy-to-use adjustable function button that lets you choose from 5 levels . Foldable Red Dot Mirror (22mm X16mm). Folds flat when not in use. At the touch of a button, the FlipDot lens pops up and opens automatically. Made of precision machined aluminium alloy, anodized with a matte black colour. Shockproof, ultra-light, durable with high performance in all weathers. Objective lens diameter: 22mmX16mm. Magnification: 1x Markings: red dots. Dot size: 3MOA. Length: 2.0 inches Width: 1.2 inches Height: 1.1 inches Weight: 1.0 oz (without plate). Battery: 1 * CR2032 battery (not included). Mountain: Sliding sleeves for G. MOS pistols and machined to accept RMR microdots.