... video input channels and 2 audio input channel, mini DVR,portable DVR,portable mini dvr This USB DVR Surveillance System (4 CHANNEL ... PSTN, ISDN, LAN, and InternetRemote MonitoringSupport remote monitoring via both Dynamic and Static IPLanguageChinese (Traditional), English, German, Spanish, PortugueseSystem RequirementsUSB: ... TX Ethernet card or integrated chipmini DVR,portable DVR,portable mini dvr