Abstract: The invention relates to a pointing device including a touch plane for an object moving thereon to generate a sound, a microphone for converting the sound into a sound wave signal, and a control unit. The control unit receives the sound wave signal and determines a moving direction of the object, so as to generate a direction signal. Accordingly, the moving direction of the object can be determined according to the sound wave signal received by the microphone, such that the volume and the cost of the pointing device of the invention can be reduced.

Abstract: The invention relates to a pointing device including a touch plane for an object moving thereon to generate a sound, a microphone for converting the sound into a sound wave signal, and a control unit. The control unit receives the sound wave signal and determines a moving direction of the object, so as to generate a direction signal. Accordingly, the moving direction of the object can be determined according to the sound wave signal received by the microphone, such that the volume and the cost of the pointing device of the invention can be reduced.

Abstract: A mobile phone with dual power supplies includes a communication unit executing communication function and a multimedia unit executing multimedia function. The mobile phone further includes a first battery supplying power for the operation of the communication unit and a second battery supplying power for the operation of the multimedia unit. The communication unit and the multimedia unit use different batteries respectively, so as to avoid the situation that the communication function is unable to be used due to excessive use of the multimedia function.

Abstract: The invention discloses a navigation system comprising a mobile communication apparatus and an agent. The mobile communication apparatus comprises a first receiver, a first processor, an input device, a first communication device, and a display. The agent comprises a storage device, a second communication device, and a second processor. The mobile communication apparatus transmits current location information and destination information to the agent. The agent processes the received destination information, the received current location information, and map information transmitted from the storage device to generate a path from the current location to the destination. According to the path, the agent generates navigation information and transmits the navigation information to the mobile communication apparatus to display the navigation information.