An electrical card connector includes an insulating housing, a metal shield defining a plurality of channels, a terminal module with a plurality of contacts received therein and a clip. At least one of the plugging heads has an expandable sealing element that is in communication with an inflation source. A single chip integration of a GPS receiver and at least one magnetic field sensing device can reduce the physical space required to provide positioning and electronic compassing capabilities in a single device, and therefore allow such devices to be smaller, lighter, and possibly more portable. Therefore, the basic color component data is normalized without division operation, and thus the complexity of the operation of the color recognition is reduced. Finally, the gate electrode of the PLTPS TFT is utilized to form a source electrode and a drain electrode in the active layer of the PLTPS TFT. The system determines the wiring phase of the unknown phase voltage from the first time interval and the second time interval.