Abstract: A Bluetooth device used for data transmission between first and second peripheral devices is provided. The Bluetooth device includes a processing circuit and a Bluetooth chip configured to be capable of being operated in a transmitting mode and a receiving mode for data transmitting and data receiving, respectively. In the transmitting mode, a first communication link is established between the Bluetooth chip and the first peripheral device through a first communication protocol. The processing circuit establishes a second communication protocol. In the receiving mode, a second communication link is established between the Bluetooth chip and the second peripheral device through a third communication protocol. The second peripheral device transmits a data to the Bluetooth chip through the second communication link and the Bluetooth chip transmits, based on the second communication protocol, the received data to the first peripheral device through the first communication link simultaneously.

Abstract: A Bluetooth device used for data transmission between first and second peripheral devices is provided. The Bluetooth device includes a processing circuit and a Bluetooth chip configured to be capable of being operated in a transmitting mode and a receiving mode for data transmitting and data receiving, respectively. In the transmitting mode, a first communication link is established between the Bluetooth chip and the first peripheral device through a first communication protocol. The processing circuit establishes a second communication protocol. In the receiving mode, a second communication link is established between the Bluetooth chip and the second peripheral device through a third communication protocol. The second peripheral device transmits a data to the Bluetooth chip through the second communication link and the Bluetooth chip transmits, based on the second communication protocol, the received data to the first peripheral device through the first communication link simultaneously.

Abstract: A detection device is mounted in a projector for detecting relations between an object and the projector. The detection device includes a detecting switch, a connector and a detecting circuit. When the object is placed into the detecting switch, the detecting switch is in an off state. When the object is withdrawn from the detecting switch, the detecting switch is in an on state. The connector is electrically connected to the detecting switch. The detecting circuit is electrically connected to the connector for activating the projector to be operated in a first mode in response to the off state of the detecting switch and activating the projector to be operated in a second mode in response to the on state of the detecting switch. The first mode and the second mode are associated with the temperature inside the projector.