iClock680 ZKTeco Time Attendance iClock 680 is a biometric fingerprint reader for time & attendance and access control applications. It adopts a brand new firmware and provides an unprecedented user experiences with stunning GUI, rock-solid stability, fast matching speed and expandability. Users can easily manage data by networking iClock680 via RS232/485, TCP/IP. Most importantly, all the functions can still operate in a networking state. iClock680 is compatible with various types of USB flash disks, ADMS and former SDK. It also supports data backup and retrieve to avoid the risk of accidental deletion. The iClock680 has access control interfaces for retrieval, Wiegand-out, door lock connection, alarm, and bell.