Abstract: A wireless data transceiver includes a case, and a circuit board mounted in the case. There are provided at least one ultra wide band (UWB) module, one antenna module, and one signal plug on the circuit board. The signal plug is projected from the case for plugging in a corresponding upstream port, which is normally a USB B type socket, on a predetermined hub. The UWB module and the antenna module are adapted to receive incoming wireless signals and transmit outgoing wireless signals, allowing the wireless data transceiver to cooperate with another data transceiver correspondingly provided on a signal processing apparatus, such as a personal computer or a notebook computer, to provide wireless signal transmission between the signal processing apparatus and various peripherals via the hub.

Abstract: A receptacle for extension cord includes a housing having multiple slot pairs and an opening; multiple metal conducting strips seated in the housing to connect to core wires of a power cord in front of the housing; and a control unit including a key pivotally mounted in the opening on the housing, a conducting link strip seated in a slit on the key with a front portion fixed to a front side of the opening to connected to a core wire of the power cord, and a curved conducting spring strip connected at a front end to the conducting link strip and at a rear end to a point behind the opening. When the key is pushed, it biases the conducting link strip to contact with one of the metal conducting strips, so that external power source is supplied to the metal conducting strip via the power cord.