PURPOSE: To automatically and safely attain loudspeaker reception while the production of a call tone of a large sound volume or a special tone without increasing the power consumption of a moving part (mobile telephone set) by providing a signal amplification function and a loudspeaker function with a comparatively large size on a charging section.

CONSTITUTION: With the moving part set to the charging section, a call tone of large sound volume or the like is generated from the charging section and whether or not the moving part is set to the charging section is detected to attain on-hook dial and loudspeaker reception automatically. That is, a 10-key pad is operated while the telephone set 3 is set to the charger 4 to call an opposite station and a hook-up key is depressed at the standby state, then a d-output of a control section 34 goes to 'H' to turn on a power amplifier power switch 46. Thus, a received tone from the opposite station is amplified by an amplifier 44 via terminals A-A for reception and a loudspeaker tone is outputted from a speaker 45.