... .CE,FCC 4 CH CCTV Security Surveillance DVR remote control Mobile Monitor Network System GS7004AD Product Features ... : live, record, playback, backup, network transmission, mobile phone surveillance4. Support backup with USB Flash Disk, ... 4CHDigital Zoom,PIPSupportsMultiplex OperationLive\display\Playback\Recording\Backup\Mobile phone Surveillance \Network simultaneouslyDisplay ResolutionPAL:D1(704 ...