No need extra Power, plug and play, from HDMI Power. Convert the micro HDMI output port on your ENVY or laptop to an analog VGA input with the micro HDMI to VGA Conversion Adapter.
*It supports full-size high-definition resolution of 720p or 1080p.
*HDMI Input: the micro HDMI Input interface.
*VGA Output: VGA signal Output interface.
*Length: About 26CM
Note: Don't support Audio output.