How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode at the top of the pod (which is actually an un-sealed disc of pre-dosed ground beans that are encased between two layers of filter paper). It is easy to insert it and push a button. https://coffeee35385.bloggactif.com/29026991/a-trip-back-in-time-the-conversations-people-had-about-pods-coffee-machine-20-years-ago