| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-portability and low-cost radio telephone set with which a function can be easily and simply changed or added. SOLUTION: By mounting a telephone function unit 2 on a main body 1 of telephone set, a control part 13 at the main body 1 of telephone set is operated and functioned as a radio telephone set based on a program previously stored in a memory 14 provided in the telephone function unit 2. By changing the unit 2 various functions of the radio telephone set can be easily changed or added. In such a case, as the unit 2, any component storing a program for changing or adding various functions of the radio telephone set in the memory 14 is used. In this case, since the unit 2 is not provided with a manipulation part 7, outside dimension of the unit 2 can be reduced and it is convenient when carrying only the unit 2. Further, since the manipulation part 7 is not provided, the component cost of the unit 2 can be reduced correspondingly. |
