Abstract: A mobile device has a solar cell and a rechargeable battery and may be connected with an external power source. A method for a power control of the mobile device allows a continuous and reliable power supply through selective connections with the solar cell, the battery and the external power source. In one embodiment, if the battery is unavailable or absent, the mobile device executes at least one function thereof by using electric power supplied from the solar cell. In another embodiment, if the battery is available with the mobile device powered off, the mobile device charges the battery by using electric power supplied from the solar cell. In still another embodiment, if the battery is available with the mobile device powered on, the mobile device executes at least one function thereof by using electric power supplied from both the solar cell and the battery.

Abstract: A mobile device has a solar cell and a rechargeable battery and may be connected with an external power source. A method for a power control of the mobile device allows a continuous and reliable power supply through selective connections with the solar cell, the battery and the external power source. In one embodiment, if the battery is unavailable or absent, the mobile device executes at least one function thereof by using electric power supplied from the solar cell. In another embodiment, if the battery is available with the mobile device powered off, the mobile device charges the battery by using electric power supplied from the solar cell. In still another embodiment, if the battery is available with the mobile device powered on, the mobile device executes at least one function thereof by using electric power supplied from both the solar cell and the battery.

Abstract: A portable communications device includes an interface unit to which a three-pole earphone or a four-pole earphone is connected. The device also includes a controller that activates a microphone function prepared in a terminal body when the three-pole earphone is connected. When the four-pole earphone is connecting, the controller deactivates the microphone function of terminal body. The device also includes an audio processing unit that is configured to output an audio signal to the three-pole earphone or the four-pole earphone under a control of the controller.