Buy on Amazon : http://www.amazon.com/gp/product/B009R6J24I?tag=catfoodrevi0a-20

Cutting Edge Products DVR Clock Smart Cam with Remote

Functions not only as the DVR but a 4 GB flash drive as well
Plug the device into any computer running Windows ME or newer or running Macs OS X
Will save the three seconds before the motion started and the three seconds after the motion has stopped