The invention that is output from that, more specifically, at least one or more than one and inlay a membrane switch having a switch contact is installed, the sound data corresponding to the contents of the sound drum is stored the storage means, the storage means on the sound drum USB ports, control means for outputting control the sound data stored in the storage means, depending on whether the selection of the membrane switch, and is connected to the USB port on the sound data audio signal outputted from the storage means and outputting the sound data to the outside comprising: an earphone for converting the output, in the earpiece, the power source means for supplying power to the sound drum via the USB port, and to adjust the output level of the switch and an audio signal for controlling on / off of the sound drum and that with the volume control means is characterized.
Accordingly, the present invention stores the audio information such as sound effects, music, narration, corresponding to the contents of the book, and by the output through the audio information earphone according to a switch operation provided on inlay, can better communicate the contents of the book, and , by hearing the audio information to be used for various shapes of the lithium battery power supply, or receiving an external power supply by using a secondary battery to be charged user anytime and anywhere portable, and, corresponding to the information while the contents of the book very useful inventions that can be heard.