an emitting device includes a plurality of buttons and can be entered into the processes of encoding , learning mold and quick encoding by the operation of the buttons . in the processes of the encoding , the encoding is generated by mixing the values of buttons , the value of time and value of rtcc to generate random code which is stored in different memory areas in a button corresponding thereto so that the user may press the buttons to send the corresponding codes and can encode within a short period of time .