This addon board connects to a Raspberry Pi Zero (RPi0) or Zero W (Wireless) via pogo pins to provide a full sized, USB Type-A connector.
You can change Raspberry pi zero or Raspberry pi zero W as a U disk via P4wnP1 P4wnP1(https://github.com/mame82/P4wnP1) project, and you use it as BadUSB device also.
With this type of setup you can have a portable device to execute Responder(https://room362.com/post/2016/snagging-creds-from-locked-machines/) or PoisonTap(https://samy.pl/poisontap/) type attacks.
About the P4wnP1(https://github.com/mame82/P4wnP1) project:
P4wnP1 is a highly customizable USB attack platform, based on a low cost Raspberry Pi Zero or Raspberry Pi Zero W (required for HID backdoor).
1xUSB-A Add-on Board for Raspberry Pi Zero W
1 set of Screws and Nuts