4CH CCTV DVR Video in/out: 4 CH BNC/ 2 CH out (BNC, VGA) Audio in/out: 2 CH BNC/ 1 CH out Support 1 HDD, maximum 2TB 4CH CCTV DVR*Main Features:*Compression format: H264 *Monitor Resolution: PAL 720 x 576, NTSC 720 x 480*Record resolution: 704 x 288, 352 x 288*Video in/out: 4 CH BNC/ 2 CH out (BNC, VGA)*Audio in/out: 2 CH BNC/ 1 CH out*Support 1 HDD without storage space limit, maximum 2TB*USB 2. ...