| 摘要 |
PROBLEM TO BE SOLVED: To prevent the request of an unexpected call tariff after a slave set is stolen or taken out by another person against the intention of its original user by selecting a first key input unit or a specific second input key unit and freely loading it to a slave set main body. SOLUTION: The first key input unit 16 and the second key input unit 22 limiting a speech condition in addition to the first unit 16 are provided. Then the first or the second unit 16 or 22 are selected and freely loaded to the slave set main body 10. In this telephone system, recesses parts 19 to be engaged with the projecting part of a release button 17 are formed at the lower tip edges of the respective first and second units 16 and 22 and projecting parts 20 for being engaged with the loading part 23 of the slave set main body 10 are provided for the upper tip edges of the units. Thereby, even when a person except for its original user takes out the slave set and uses it, speaking is limited as long as the second unit 22 is loaded to it. Thus, inconvenience that a large amount of call tariff is requested, etc., is eliminated. |
