... Audio -Support All Windows OS -Easy Connect All Laptop & PC 4 Channel Full D1 H.264 Laptop USB 2.0 DVR Card ... ,Support Windows 7 64bits & all window OS4,Video/Audio Channel:4chs video/4 chs Audio5,Compression mode : H.264 Main Profile6,Display ... processor,256MB RAM,10G available Hard DiskWelcome to visit SOONY!!! 4 Channel USB 2.0 DVR Card (SY-UR041)