"Why can't I listen on the cheese Danish?" - Maxwell Smart.
Max talks to his coffee.
Two-way radio comprised of a cup of coffee and a donut.
The user talks into the coffee and listens to the donut.
Part of a suite of refreshment-themed communications devices which also includes the Martini and Olive Radio and the Sandwich and Potato Chip Phone used when Max and 99 are undercover as an airline passenger and stewardess.
[Episode #89: "Closely Watched Planes".]