Systems, methods, and audio output devices are described. In one aspect, an audio output device includes a communication module that communicates with an external electronic device, a speaker that outputs sound, a mounting detection sensor that detects whether the audio output device is mounted on a user of the audio output device, and a control circuit that is electrically connected with the communication module, the speaker, and the mounting detection sensor. The control circuit wirelessly connects the external electronic device with the audio output device using the communication module if the mounting of the audio output device is detected by the mounting detection sensor, receives audio data from the external electronic device through the wireless connection, and outputs the audio data using the speaker.