... CH h.264 network digital video recorder 2. 4 channel digital video recorder 3.dvr digital video recorder 4CH Digital Video Recorder H.264 Compression Realtime ... -ch ones) A variety of backup (USB disk, mobile hard disk, network) One USB2.0 for data backup, ... playback4channel playback simultaneously Recording backupSupport USB flash disk, mobile hard disk, network backupHDDSupport 1 SATA HDD,capacity to ...