Ade Advanced Optics Green Pistol Laser fits Walther P22 Ruger SR 22 XDM XD Sub Compact Fits: Walther p22, Ruger Sr 22 Xdm Xd Sub Keltec pf9, Gluck 17,19,20,21,22,32, Ruger Sr9, Ruger sr9c Fits most Smith and Wesson pistols, Sig Sauer p250 full and compact and other Very compact and light With On/Off pressure switch pad, Green laser with Strobe function Operates with a CR2 battery(included)