Crimestopper UBB-4Q Quad Screen DVR Monitor (White) Digital Video Recording System With Quad Screen Processor Provides Around-the-clock Video Surveillance Recording Of Vehicle Allows 4 Different Cameras To Record Simultaneously 4 Different Trigger Zones: Ignition, Reverse, Dome Light & Turn Signal Recordings Can Be Viewed On A Quad Monitor In Vehicle Or On Home Computer Uses Sd Card For Memory4gb Max