A waldo is an electronic telemetric input device Muppeteers use to remotely perform characters. Shaped like a Muppet's head, the waldo sends radio signals to a mechanism in the puppet that moves the puppet's mouth in sync with the waldo's mouth. Waldos are sometimes used in conjunction with a computer interface that provides enhanced control of the puppet. Waldo C. Graphic, the computer generated Muppet, is performed entirely with a waldo; the device also inspired his name.