... audio input channel, mini DVR,portable DVR,portable mini dvr This USB DVR Surveillance System (4 CHANNEL) is a great safety system for your home/office/shop ... IPLanguageChinese (Traditional), English, German, Spanish, PortugueseSystem RequirementsUSB: Compliant USB 2.0 free portOS: Windows 2000 / XPCPU: Pentium 4 ... /1000 BASE-TX Ethernet card or integrated chipmini DVR,portable DVR,portable mini dvr