... , USB*1,network,Audio, RS485 , IE browse, 25languages Features:4CH,H.264 compression,support SATA HardDisk, Mouse, USB*1,network,Audio, RS485 ... 4 channel alarm input, 1 channel alarm output); Support TCP/IP protocal,PPPOE,DDNS ,USB Supports 4-channel recording and playback ... search(accurate to second) Space Occupation Audio :28.8MB/H Video:25~450MB/H Video storage Hard disk, , and net Backup Mode ...