... USB*1,network,Audio, RS485 , IE browse, 25languages Features:4CH,H.264 compression,support SATA HardDisk, Mouse, USB*1,network,Audio, RS485 ... ,50 f/s) NTSC(525 line,60 f/s) Surveillance quality PAL,D1(704×576) NTSC,D1(704×480) ... accurate to second) Space Occupation Audio :28.8MB/H Video:25~450MB/H Video storage Hard disk, , and net Backup Mode ... 106kpa Dimension 310mm x 220mm x 45mm(W*D*H) Weight 2.5 kg