... good service. (GS-6000B)RFID Guard Tour System Guard Tour Control, Guard Tour System, Guard Patol System, Guard Patol Device, Guard Tour Reader, Patrol System, Security Patrol System, Patrol Reader, Guard Tour, Patrol Device is easy to ... piece, serial number in the card, clue on message(just for GS-6000C)4. Large memory: 4MB Flash memory, 30thousand data ...