alternatively a sleep mode setting switch or a sleep mode selection switch can be provided and this setting switch can be turned on or the sleep mode selection switch can be set to the setting mode side to set the device in the sleep mode when either of these techniques are used for setting the device in the sleep mode a sleep mode request is issued to the above mentioned cpu 10 and then the sleep mode flag is set after the sleep mode is initially set the stuffed toy is placed in the sleep mode after conversation with the toy is finished in this particular embodiment if the speaker is quiet for a specified duration or if the speaker says 34 be quiet 34 or 34 good night 34 to the stuffed toy the device interprets this as a sleep mode request sets the sleep mode flag and places itself in the sleep mode the processing that takes place in such a configuration will be explained with reference to the flow chart shown in fig4 first it will be assumed that initial setting of the sleep mode has already been performed in a manner described above as is known in the art even during the sleep mode input sound signal power detector 9 remains active and ready to detect the power of the input sound signal fetched by sound signal input unit 1 however cpu 10 is placed in a non active state or.