... 3G, also support cottage phone 16CH H.264 Powerful Web Camera Recorder CCTV DVR System Feature:H.264 double stream, advanced and filtering ... USB-RW ,USB upgrade cooperation stableSimilar to Windows operating style, powerful mouse right menu functionPowerful web function( ... ,multi-chSearchtime,loglist,event, ChannelBackupHDD/SpaceAudio: 28.8M / h+Video: 25 ~ 450M / hStorgeHDD, WEBBackup modelWEB,USB,USB ...