C series of graphics, characters, time Adder is superimposed on the video signal date, time, graphics and character of the common equipment. Image signal can be superimposed on each control characters or graphics. Graphic dot-matrix method used can be superimposed on the screen of the specified location and a variety of fonts of various BMP graphics. PC users can run the necessary software through RS232 serial port settings on the graphic characters. When the image changes, overlay graphics / character stable, clear, no jumps; and black border with white graphics or characters in a way that highlighted not affect the light or white screen. The device is suitable with various brands of video equipment to match.