... Time and Attendance System, Fingerprint Attendance System, Attendance System, Time and Attendance,Fingerprint Time Attendance System,Fingerprint Time Recorder ... Accept ODM or OEM, providing system analysis, casing-making, circuit design, producing-assembly, package design, etc, linear service ... ZK new algorithm4. Hardware Platform: ZEM510 5. Operating System: Linux 6. Communications: RS232 ,RS485,TCP/IP ...