Y-6354 is a 4-in-1adaptorwhich can convert a Mini DisplayPort to VGA, DVI and HDMI without affecting video quality. Also, a set of audio output is used to support audio to VGA and DVI screen. By the way, this converter can be used to extend to HDMI, DVI and VGA simultaneously. In additional to that, the converter has a power interface, it supplies power to the converter with 5V power adaptor (use when necessary). The purpose of providing power to the converter is to enhance the performance of the converter, especially when connecting to HDMI, DVI and VGA simultaneously.