A casing which accommodates an electric circuit (13-17) for generating sounds of different tones or voice sounds has a recess (11) defined in its upper panel and a loudspeaker (12) disposed therein and mounted on the upper panel for reproducing and radiating sounds or voice sounds. A plurality of tone plates (2) can selectively be placed, one at a time, in the recess. Each of the tone plates (2) has dots (21) and a bar code (22) indicative of a sound or voice sound of its own. When one of the tone plates (2) is inserted in the recess (11), the dots (21) or bar code (22) is detected by a sensor (13) in the recess (1), and the electric circuit (13-17) enables the loudspeaker (12) to reproduce and radiate a tone or voice sound which is indicated by the inserted tone plate (2).
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