In general, the subject matter described in this specification can be embodied in methods, system and program products. A mobile computing device determines that the mobile computing device has physically paired with a docking system. Wireless communication between the mobile computing device and the docking system is automatically established in response to said determining that the mobile computing device has physically paired with the docking system. Data that encodes an audio signal is transmitted, by the mobile computing device and to the docking system as part of the wireless communication, so as to cause speakers of the docking system to audibly output the audio signal from the mobile computing device.