Some cards weren't useful at all, including a calendar card that only had room to display one appointment (and it was invariably someone else's from a team calendar).
Then, that data was pushed to a tablet after placing the Droplet on the display, pulling up the same calendar appointment and providing a physical interface for adjusting the date and time, which is retained in the cloud and the module itself, which also outputs pulsing light as it counts down to the appointment time.