With the app you can always track where the autonomous Snack Mobil is on the Carlswerk site at Schanzenstraße 6-20 in Cologne.

This is how the Snack Mobil works:
Use the app to quickly find the Snack Mobil at the Carlswerk.
Wave to the Snack Mobil. It recognizes you at a distance of 3-5 meters and then comes to you.

Select the snacks that you feel like eating on the screen. You can pay directly with your credit card.
That's it. Enjoy your time out.