| 摘要 |
A headphone combined with a battery charger is provided to charge a hand-held multimedia product by integrally mounting a secondary battery to a headphone. An acoustic connection terminal(20) is connected to a first interface(210) of a multimedia device(200). An acoustic signal is inputted to the acoustic connection terminal. A power connection terminal(30) is connected to a second interface(230) in order to supply the power to the secondary battery of a multimedia device. The power source from outside is supplied with an external power input terminal(40). A secondary battery(50) is charged with the power source from the external power input terminal. A voltage comparator(60) compares the voltage of the secondary battery with the voltage of the secondary battery of the multimedia device. A controller(80) controls the secondary battery, the voltage comparator and an operation key(70). |
