Product Tag - EM4423

TP-RFID offer EM4305, EM4200, EM4100, TK4100 (compatible with EM4100 chip), ATMEL T5577 and compatible HID 125KHZ Proximity Cards, mostly Low Frequency RFID Cards are read only like EM4100, TK4100 etc. But ATMEL T5577 and HID 26bits and HID 37 bits can read and re-write data inside.