... USB, 4CH Full D1 Digital Video Recorder Real-time DVR FeaturesWith H.264 High efficiency Video CompressionSupport 4CH playback at same time ... )Space OccupationAudio: 28.8MB/H Video: 25~450MB/HVideo storageHard disk, , and net, SD cardBackup ModeNetwork burn, mobile Hard ... disk and USB burnVideo Input8channel, BNC, 1.0Vp-p,75ΩVideo Output1 channel, ...