... of reaction:2 -20cm 3)Encapsulation materials Keyfob EM-ID cards for access control system,smart card, ... ,yellow,red color optional All colorsPackage appearance Chips EM Switzerland tiny electricity EM4102 EM4100 TK4100Operating frequency125KHZDistance of reaction2 ... ABSTypical applicationTimecard,enterprise one card system etc Keyfob EM-ID cards for access control system,smart card,125KHZcard ...