A system includes an earphone having an earplug, a processor, a wireless interface, a battery, a memory, and a speaker, and an electronic device separate from the earphone and in communication with the earphone via the wireless interface. The electronic device transmits audio to the earphone for storage in the memory. The processor of the earphone causes the speakers to play the audio stored in the memory in a loop. The electronic device and the processor of the earphone do not operate the wireless interface continuously after the audio is stored in the memory.