Abstract: A single-ear wireless headset is provided herein, which mainly contains a body member, an arm member, a hook member, and a joint member having a twisting element. On the two sides of the body member, two radially opposing connecting holes are provided for the connection to the joint member and the arm member respectively. The joint member in turn houses a leg of the L-shaped twisting element whose other leg is embedded inside the hook member. Because of the configuration of the twisting element, the hook member can be swung around the joint member for wearing on a user's either left or right ear, without altering the orientation of the ornament features on the body member and the hook member.

Abstract: An automatic attribute adjusting Blue Tooth wireless communication device is disclosed, which adjusts itself to appropriate attribute based on the attribute of the electronic device it connects, so as to enable the said electronic device to exchange Blue Tooth wireless packets with another electronic device containing the Blue Tooth wireless communication capability. The attribute denotes one of the Master and Slave. The Blue Tooth wireless communication device disclosed by the present invention comprises USB interface, attribute control module, and Blue Tooth module. Wherein, the attribute control module is used to obtain the attribute of the electronic device via the USB interface, and based on the attribute obtained to set the attribute of the automatic attribute adjusting Blue Tooth wireless communication device to the attribute corresponding to that of the said electronic device, so as to enable the Blue Tooth wireless communication device to exchange data with the said electronic device.

Abstract: An improved band pass filter of ?-type inductor is disclosed, which utilizes the serial inductor in the ? as a compensating inductor, which can lower the coupling coefficient of the band pass by adjusting the inductance ratio of the compensating inductor to that of the two parallel grounded inductors. Therefore, the coupling coefficient is lowered by adjusting the inductance of the ?-type inductors, avoid noise generation, and obtain optimal band pass characteristics, while miniaturizing the filter.

Abstract: A portable device for both media playing and wireless communication is disclosed, including a housing case, and a circuit board housed inside the housing case. A wireless communication unit is electrically connected to a switch and the wireless communication unit includes an integrated IC chip for wireless communication. The switch is switchable to wireless communication unit for communication upon receiving commands from users or receiving incoming calls for voice signal or data communication. The switch is used to control input unit for transmitting voice signal to wireless communication unit.

Abstract: An improved band pass filter of ?-type inductor is disclosed, which utilizes the serial inductor in the ? as a compensating inductor, which can lower the coupling coefficient of the band pass by adjusting the inductance ratio of the compensating inductor to that of the two parallel grounded inductors. Therefore, the coupling coefficient is lowered by adjusting the inductance of the ?-type inductors, avoid noise generation, and obtain optimal band pass characteristics, while miniaturizing the filter.