4-Channel Mini Quad Video Multiplexer With USB DVR Adapter And IR Remote
4-Channel PC-Based Quad Video Switcher + USB DVR Adapter | eBay
Easy Capture 4 Channel USB DVR Surveillance System
Amazon.com : VideoSecu 4 CH USB 2.0 DVR PC Digital Audio Video Security Camera Surveillance Recorder DVU105 M6X : Complete Surveillance Systems : Electronics