Specification:

MPEG4/MJPEG DVR technology
Real Time Recording/ Playback 720x480(NTSC)/ 720x576(PAL)
Multiplex allow live display, record, playback,
Backup & network operation at the same time
Time, date & HDD storage on screen display
Support network recording & backup
500GB can record more then 170 days (4CH, CIF best quality, 15IPS)
Selectable motion detection area & sensitivity adjustment for individual camera,
Video signal loop back capability, remote
Surveillance with licensed software AP
IE brower and Java phone
Support 1 audio in and 1 audio out
System auto recovery after power reconnected.