| 摘要 |
PURPOSE: To enable the charging of a battery or the exchange to a new battery without having any trouble in operations by recognizing the state of the remaining voltage of the battery before the speech becomes unable to maintain by turning on a standard state, in which the battery voltage of a mobile radio terminal is settled within a specified value, and a dangerous state, in which that voltage is lowered than the specified value, as an incoming call LED while changing its light emitting color by using the LED of double color light emission. CONSTITUTION: When it is detected by a battery voltage detecting circuit 10 that a battery voltage PS gets lower than its specified value, at the mobile radio terminal, an LED 2 to emit light in red different from the green of an LED 1, for example, turned on by an LED control member 20 up to the moment is turned on as the incoming call LED by an LED selecting circuit 3 to be operated by that detecting signal. Thus, the user of the mobile radio terminal can recognize that the battery voltage gets lower than the specified value according to the red light emitted by the LED 2. Besides, since the incoming call LED is used for warning the voltage reduction of the battery for driving the mobile radio terminal, the circuit is simplified. |
