Product information "SF420 Acc Control Fingerprint Reader MF"
"SF420 is an IP based fingerprint terminal for access control and time attendance management. Comes with built in RF Mifare Card reader. Antipassback function is also enabled to maximize the security level. Auxiliary input interface allows SF420 to connect with an extra source, for instance, a smoke detector or emergency switch. Once the linkage function is enabled through the machine menu, the device generates an alarm signal and opens doors in case of emergency."
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