... Linux operation system. Fingerprint Attendance, Fingerprint Time Attendance, Fingerprint Time and Attendance, Fingerprint Time and Attendance System, Fingerprint Attendance System, Attendance System, Time and Attendance,Fingerprint Time Attendance System,Fingerprint Time Recorder ... bell, Webserver, USB host, USB client, Short message 17. Optional: ID/HID card, Workcode, RIS, 5V UPS