| 摘要 |
PROBLEM TO BE SOLVED: To issue a warning by detecting that a portable telephone is being used or a power supply is turned on with a simple configuration.SOLUTION: A portable telephone monitoring device for receiving a radio signal from a portable telephone, and for, when detecting that the portable telephone is being used, issuing a warning or making a notification of information related to the use of the portable telephone by a predetermined method is configured to determine the presence/absence of the use of the portable telephone on the basis of the duration and strength of a radio signal generated by the portable telephone, and to, when determining that the portable telephone is being used, issue a warning or perform a notification.SELECTED DRAWING: Figure 1 |
