... b. VGA interface c. support over 10 languages d. 4ch network dvr e. support six operation Key Feature - good stability, with ... performance, support WEBSERVER- perfect SDK,convenient to access large network monitoring platform- H.264 compression format, the D1 preview, ... , Speed dome cameras, network IP cameras, wireless cameras and camera accessories. Real Time Full D1 4 Channel DVR, H.264 Compression, ...