Abstract: A test apparatus for testing quality of serial interface communication between two CPUs of a dual-mode handset includes a processor module and a switch module. The processor module includes two serial ports, each serial port includes an output connector and an input connector, and the two input connectors respectively connected to the two CPUs. The output connector of either serial port connected to either CPU via the switch module. The processor module controls the CPU connected to the output connector to work when the switch module is switched on, and checks data transmission between the two CPUs via the two input connectors when the switch module is switched off.

Abstract: A dual mode communication device comprises a first mode chip, a second mode chip, a switch, a first headphone jack, and a second headphone jack. The first headphone jack is electronically and selectively connected to the first mode chip or to the second mode chip through the switch. The second headphone jack is electronically connected to the second mode chip. The dual mode phone can simultaneously establish two voice communications with two other communication devices using the first mode chip and the second mode chip by respectively transmitting voice signals of the two voice communications through the first headphone jack and the second headphone jack.

Abstract: A system and method controls dual memory cards of an electronic device. The electronic device includes a first memory card and a second memory card. The method sets a first trigger command for connecting the first memory card to a processor, and a second trigger command for connecting the second memory card to the processor. The first memory card is set as a default memory card to connect to the processor. If the electronic device has received the second trigger command, the method controls a processor to communicate with the second memory card through an analog switch and a second connector. If the electronic device has received the first trigger command, the method further controls the processor to communicate with the first memory card through the analog switch and a first connector.

Abstract: A stylus includes a main body and a holding member. The holding member connects to the main body. With the holding member being rotatable relative to the main body, a distance between an end of the holding member and the main body is changeable. The stylus is convenient to be used and taken along.

Abstract: A dual mode communication device comprises a first mode chip, a second mode chip, a switch, a first headphone jack, and a second headphone jack. The first headphone jack is electronically and selectively connected to the first mode chip or to the second mode chip through the switch. The second headphone jack is electronically connected to the second mode chip. The dual mode phone can simultaneously establish two voice communications with two other communication devices using the first mode chip and the second mode chip by respectively transmitting voice signals of the two voice communications through the first headphone jack and the second headphone jack.

Abstract: A test apparatus for testing quality of serial interface communication between two CPUs of a dual-mode handset includes a processor module and a switch module. The processor module includes two serial ports, each serial port includes an output connector and an input connector, and the two input connectors respectively connected to the two CPUs. The output connector of either serial port connected to either CPU via the switch module. The processor module controls the CPU connected to the output connector to work when the switch module is switched on, and checks data transmission between the two CPUs via the two input connectors when the switch module is switched off.

Abstract: A stylus includes a main body and a holding member. The holding member connects to the main body. With the holding member being rotatable relative to the main body, a distance between an end of the holding member and the main body is changeable. The stylus is convenient to be used and taken along.