Multipurpose systems can include networked devices configured to include microphones, motion sensors, video cameras, touchscreens, optical sensors, speakers, or other suitable devices. The networked devices can include networking capabilities that enable the networked device to communicate with target devices and other networked devices. A system of networked devices can identify a target location or a target device by analyzing audio signals received at microphones of the networked devices. For example, a plurality of networked devices can identify a particular networked device that is in closest proximity to a user by analyzing an audio intensity of an audio signal received at the plurality of networked devices. The identified networked device can serve as a master device that can control a state of target devices.