PCR340 is a simple- to- use device applying dual 125Khz and 13.56Mhz RFID technology to read the unique serial number of the RFID card.  It is good to be used for the system access logon/logoff key and the system operator identification, such as POS system logon/logoff and operator identification /authorization with RFID card.  PCR340 is a perfect system logon key which can protect the system and prevent the unauthorized people from using the system