... WEBSERVER- perfect SDK,convenient to access large network monitoring platform- H.264 compression format, the D1 preview, playback D1 Specification Item No ... Out2ch(1ch BNC, 1ch VGA)Video Frame RatePAL 1~25/s,NTSC 1~30/sStream Typevideo and audio streamAudio Input4chAudio Output1chAudio ... cameras, wireless cameras and camera accessories. Real Time Full D1 4 Channel DVR, H.264 Compression, RT-6004V