Great little device, it tests great so far, I don't have a project in mind for it yet, but pan to use it soon on something cool, maybe use it on a solid state relay to unlock a magnetic door lock as the blkbox is very small and can be hidden easily for a backup when I loose my rfid (or forget the password lol)
addendum I have used it since for flashing a few esp8266 boards to disconnect power since it fits on the breadboard so easily in such a small space just hold down the gpio pin low button and toggle the switch
This product is a shallow tray that holds the Arduino board securely and protects the bottom of the board. The base is nicely finished and has labels on the sides for connectors. Shipping was prompt. No documentation necessary.