The ALOGIC Elements 15cm HDMI to VGA Female Adapter With 3.5mm Audio Adapter is mostly used to convert a Digital HDMI signal to an Analogue VGA signal with an analogue audio output. The adapter is suitable for use with most Ultrabook/ Laptop/Desktop and Apple TV. When used with Apple TV adapter lets you stream content (Audio and Video) wirelessly to a projector enabled with a VGA input from your AirPlay supported iPad iPhone iPod and Mac.* The adapter may need external power through the Micro USB port on the adapter via a Micro USB cable when used with certain computers and Media Players for proper functioning. The Micro USB cable is not included in the box needs to bought separately.