TRUSTECH Raspberry PI VGA 666 VGA666 Adapter Board Raspberry Pi 3 Model B/Pi 2/ B+/A+ Educational Electronic Hobby Kit

The Raspberry Pi has an HDMI port to connect a display. If your monitor only has VGA, you have to use an adapter. Because this requires a digital-to-analogue conversion, those adapters can be quite pricey, and they can draw lots of power. As well as just allowing you to connect a VGA monitor natively. And unlike composite video, the DPI interface can be run independent of the HDMI. The software for dual screens is still under development. Running two screens at maximum resolution will depend on the speed of GPIO.