Uses a backload horn system. The horn construction provides powerful bass playback with a sense of speed. Powerful altitude sound with back-road horn Backload-horn style speaker box for P1000K and P1000 ("Stereo (Musonosha)" Magazine August 2015 Issue and 10cm Full Range Speaker Unit).
Do not use in places where water is directly exposed to the device. Also, please do not use it in an abnormal condition