1. This adapter is not bi-directional, and can only support signal from HDMI source devices to VGA displays. For VGA source device to HDMI converters, please check item VGA to HDMI converter (ASIN: B00QUWEBXE & B00QUWEC06)
2. The micro USB cables included is required for MacBook Pro with Retina Display, Apple TV, Smart TV Box, Raspberry Pi, devices with low-power output HDMI port. You can connect this micro USB cable to power adapter or USB port on your PC for additonal power
3. For Raspberry Pi, you may need to revise the config. txt and reboot.