| 摘要 |
PROBLEM TO BE SOLVED: To provide a hands-free device capable of turning off a power supply of the hands-free device at an appropriate timing, an electronic device, an information system, and a power supply control method of the hands-free device.SOLUTION: A short-range communication unit 34 performs short-range radio communication with a portable terminal 10. A communication quality measurement part 36 measures quality of a signal transmitted from the portable terminal 10. A communication situation determination part 37 determines whether the communication quality is improved. A power supply control part 38, when it is determined that the communication quality is improved, turns off the power supply.SELECTED DRAWING: Figure 1 |
