An apparatus comprises an audio or video jack connector configured to receive an audio or video jack plug of a separate device, a detection circuit in electrical communication with the connector, and a processor communicatively coupled to the detection circuit. The connector includes an electrical contact for connection to a conducting terminal of the plug. The detection circuit is configured to determine a resistance at the conducting terminal. The resistance is a resistive load of the separate device at the conducting terminal of the plug. The processor is configured to identify a function of the separate device according to the determined resistance, and configure an operation of the apparatus according to the determined function.