... USB*1,network,Audio, RS485 , IE browse, 25languages Features:4CH,H.264 compression,support SATA HardDisk, Mouse, USB*1, ... ,BlackBerry ,mobile phone live view via 3G net 4ch separate video display and compression,video simutanelously 1CH Audio ... microcontroller Operating System Embedded LINUX System Resources multi-channel real-time recording and playback, multi-channel net operation for several persons ...