At home, your headphones while charging the phone's speaker dock was designed. When combining headphones and speakers attached to the headphone volume using the jog dial to adjust the speaker volume is possible. Attending with headphones while listening to the jog dial volume control was possible in the direction of design. When charging is completed, you can use headphones outside the combined indoor and outdoor speaker design is proposed. Designed with Jeong Seung-Tae, my friend.