Abstract: A method and apparatus for sending a control signal to an electronic device includes an accessory (200) of the electronic device detecting activation of a first switch (204) of the accessory and, responsively, controlling a second switch (206) of the accessory to generate a first control signal that instructs the electronic device to enable a function while the first switch is activated. The accessory sends the first control signal to the electronic device over a microphone line (208) coupled to a microphone (210) of the accessory and configured to be coupled to the electronic device. For a specific embodiment, the method includes the accessory detecting deactivation of the first switch and, responsively, controlling the second switch (206) of the accessory to generate a second control signal to instruct the electronic device to disable the function, and sending the second control signal to the electronic device over the microphone line (208).