... -RW 4.USB Backup,SATA port 5.IN:16Ch Video 8-Channel Standalone DVR AST-DVR0804LBH.264 Algorthm, Pentaplex, Support Internal CD / ... record, bios version, on-line user etc.VideoVideo Input4/8/16 channel, BNC, 1.0Vp-p, 75?, looping(optional)Video Output2 ... , Alarm, Motion Detection & exact search (accurate to second)Playback2 channel playback simultaneously, pause, stop, rewind, fast play, slow play, ...