Worlds original, smallest, lightest, toughest mini day / night sight for all military, law enforcement and sporting small arms. With over 100"000 delivered to date, Shields Mini Sight has a proven track record. The SMS was designed originally for use with pistols and has since evolved into an all round combat optic, used intensively in war zones all over the globe. Over 15"000 units are in use by the British regular army and Special Forces, as well as US, Australian, New Zealand Special Forces and other NATO forces. Also used by competitive sports men and women across the globe. Shoot early with both eyes open, hit early whilst providing large peripheral vision. It continues to excel in competition shooting and self defense and is a great choice for any and all aiming needs.Features :Parallax Free, Clear Polymer OpticAnti-Reflection No Colored CoatingOne 3V Lithium Battery, Cr2032Glass Filled Polymer Construction4Moa Dot