A portable personalized tracker card is provided. The absorber is formed of a ferrite sintered body, which may be divided into sections. A sub-set of the M secondary synchronization codes including K secondary synchronization codes is allocated to the base station. Step C is that wireless input receiving apparatus starts searching in order to receive the packets of step B. Posted barter orders from the display are selected to effectuate a barter transaction which combines a barterer’s barter order with the selected posted order. Thus, the surface will not be occluded during a cleaning process.