4 channel USB DVR  for laptop detail:

4 channels video input in one card, the maximum display/recording rate is 25 fps under PAL format, and 30 fps under NTSC format. 1 channel audio input.4 screen display modes are available.
Multi alarm triggering method: sensor, motion, video loss, and HDD space shortage.
Support schedule recording mode, recycling recording method available.
MPEG4 video compression format. 5 level recording quality options available, and the recording frame rate range from 1 to 30 fps adjustable for each channel. Support multi-channel playback, searching by time/date and recording events, images can be zoom/capture/save/print/backup.Support remote surveillance and PTZ control through web browser, support dynamic domain name.Configurable auto reboot function for preventing PC deadlock.
System Requirements:
1.Windows 2000/XP or better
2.CPU: Intel P4 Celeron processorminimum 1700MHz
3.Motherboard : Intel 845/865/915 series