This is a modular mount for the Square Contactless Chip Reader. This allows you to easily move the reader to different locations, it is based off of the current Square system that they sell. You can put this anywhere like on the back of a spare IPhone case and easily make the reader removable. This uses super glue to hold the two pieces together and 19mm thick double sided sticky tape to hold the reader to the unit.

Demo: https://youtu.be/kN-HlxK0B3g