| 摘要 |
PURPOSE: A hands-free set is provided to insert an ear phone jack of a cellular phone without setting up the hands-free set to in a car, so that a customer can buy the hands-free set at a low cost, and safely drive the car. CONSTITUTION: A cellular phone(10) has an ear phone jack(1). A plug(4) is inserted into the ear phone jack of the cellular phone. A multi-oriented condenser micro phone(2) amplifies driver voices to input the driver voice to the ear phone jack through the plug. A radio frequency transmitter(3) applies a frequency modulation to a received other voice signal. A hands-free set(20) is installed to attach/detach miniaturized batteries, and is used as an operation power of the hands-free set.
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