US Patent 10129626 Case including speaker for outputting sound using earphones

Provided is a case including a speaker for outputting sound using earphones, the case including a master earphone for receiving an audio signal from an external device through Bluetooth communication, a slave earphone separate from the master earphone to receive the audio signal from the master earphone through Bluetooth communication, and the case including a pair of coupling parts capable of individually accommodating the master and slave earphones, wherein the case further includes a charging unit for supplying power to the master and slave earphones, and the speaker for outputting the audio signal received from at least one of the master and slave earphones.