... channel editing function(favorite ,move,lock,rename and sort)Parental control for channelsEase to use Menu systemSoftware upgrades through RS232 port ... on size of HDD,512M~8G size will reserve for time shifted recordingLock/Delete/Rename,Preview playback,Browse record files informationPlay ... 1/2, 1/4,1/8,jump to user selected time point remote control S810B