Video:
1) Video input: 4ch input, 1.0V (P-P), 75? (BNC), PAL / NTSC
2) Video output: 1ch output, 1.0V (P-P), 75? (BNC), BNC or VGA (option) output
3) Display: four screens or full screen

Audio:
1) Audio input: 4ch input, -8dB 22k?, RCA, AV simultaneously
2) Audio output: 1ch output, -8dB 3k?, RCA
3) Audio compression: MPEGI layer I / II, compression code rate selectable

Record:
1) Recording frame: 100f/s (PAL), 120f/s (NTSC)
2) Picture quality: 9-grade picture quality selectable, playback resolution is 352x 288, up to 704 x 576 for one channel
3) Recording mode: constant, circular, scheduled, motion detection, pre-alarm, auto save recorded files when powered off
4) Recording time: depend on hard disk, picture quality, 4 IDE interface can drive1 or 2 hard disks
5) Search mode: by time, location, alarm
6) Playback mode: fast forward, fast backward, each frame replay

Backup:
1) CD backup: by connecting backup interface with CD-RW driver, the file can be played in DVR or PC
2) Hard disk backup: by connecting backup interface with hard disk
3) Network backup: by connecting network interface with PC

Alarm:
1) Alarm input: 4ch input
2) Alarm output: 2ch output
3) Buzzer output: 50dB
4) Alarm mode: picture lost, motion detection, device failure (including hard disk failure)