... , 16X forward or backward, support playback by timeAlarmAlarm input4-channel alarm inputAlarm recordingPre-recording function, 15 seconds pre-recording, post-recording ... 30 sec ~ 30 min adjustableAlarm output2-channel alarm outputEvent alarmOverspeed alarm, acceleration alarm, motion detection alarmCommunication interfaceSerial interfaceSupport one RS232 interfaceNetwork interfaceRJ45 ...