... 250pcs/withe box,20white box/cartonSense distance:2-15cmSense time:1-2 secondAvailable Chips: EM4100,EM4200,EM4305,EM4450,TK4100 ... Air/By Ship/ExpressApplication: Patrol Management System, Time and Attendance Management System, Access Control System ,Bus All-in-one Cards,School All ... schools, telecommunications, In-tenet cafes, shopping malls, hotels and so on fields. We treat every card as a treasure ...