4CH,H.264 compression support SATA HardDisk, Mouse, USB*1,network,Audio, RS485 , IE browse, 25languages Features:4CH,H.264 compression,support SATA HardDisk, Mouse, USB*1,network,Audio, RS485 , IE browse, 25languages Hisilicon Hi3515chip; Support Symbian,Windows mobile,Iphone,,android ,BlackBerry ,mobile phone live view via 3G net 4ch separate video display and compression,video simutanelously ...