1 Dimensions: 51.7mm*31.8mm*8.1mm 28mm*41.5mm*2mm 2 Operating Temperature: -40~85 3 Storage Temperature: -55~100 4 Resonant Frequency: 125khz 13.56mhz 5 Color: red,black, blue, gray, yellow ,etc 6 chips:EM,mifare,infineon,icode,inside,atmel Time & Attendance System, Access Control.