... 2) Chip:EM4100/125kHz, MIFARE1S50/S70/13.56MHz 3) Applications: Access control ,etc. Features:1) Size:41*32*4.2mm2) Working frequency ... ) Color: purple, blue, gray, yellow,mahogany6) Packing: 100pcs/polybag7) Applications:Access control, hotel locks, staff attendance and salary management, school campus ... get more details . website:www.theory.com.cn different color RFID Key fob