| 摘要 |
The invention provides that when switching over between a hand-held operation (normal operation) and a hands-free talking operation, the loudness level is successively increased to a preset hands-free talking loudness. When switching over between the hands-free talking mode and the hand-held operation, the loudness level is successively decreased to a loudness that is preset for normal operation. To this end, a mobile unit comprises a switch-over button, which enables a switching over when the mobile unit is placed against the ear.
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