CCTV DVR H.264 compression format 4ch video input,1ch BNC output,1ch VGA output 4ch audio input,1 ch audio output USB backup 4CH, H.264, SATA ... ~25/30fps);Channel 2~4: CIF/QCIF (1~25/30fps), D1 (1~6fps)Extra Stream: QCIF(1~25/30fps)Bit Rate32 ... , Next camera, Previous camera, Full screen, Repeat, Shuffle, Backup selection, Digital zoom(any size)Backup ModeFlash drive/ USB HDD/ USB CD ...