4CH DVR camera alarm with siren & PIR 1.H.264 DVR compression 2.4 ch D1 playback 3.VGA+Alarm+PTZ 4.USB backup Features:1.H.264 main profile compression2.Realtime live display up to 4 channel3.Pentaplex function:live,recording,playback,backup & remote access4.Supports complex streaming encode, recording, playback, net transmission, backup, wireless monitor and DVR operation simultaneously5. ...