This adapter board converts a Raspberry Pi Zero (any version) to the Raspberry Pi 3B format, allowing you to maintain projects, designs and products that use the older Raspberry Pi 3 Model B format by utilising Raspberry Pi Zero boards.
The adapter board connects the power, USB and HDMI connection of the Pi Zero to the adapter board, to convert the format to 3B style. An onboard USB switch allows you to switch the Ethernet and USB port between the Zero and PWR/USB port.