... Audio output bite rate8KHz/64KbpsAlarmAlarm TypeExternal sensor, Video lost, Motion detection, Video shield, HDD error, Unauthorized user access detection ... HDD notification, HDD lost alarmAlarm LinkageBuzzer, Snapshot and video recording, email notification, External Alarm outputAlarm input16 channels ... interfaces: one for USB flash /USB HDD; the other for USB mouse SATA interface8pcs SATA hard disks ...