The present subject matter includes a first capacitor stack including a first plurality of anode layers and a first plurality of cathode layers and a second capacitor stack including a second plurality of anode layers and a second plurality of cathode layers. In one embodiment, the installation instruction conveying device is comprised of a first surface having instructions visibly disposed thereon for installing a component. The user equipment measures the power level of a received signal. These probable regions are overlapped, and the blindfolded node’s estimated location is estimated to be the geometric center of the overlapped regions. The sound is audible to the operator and may be amplified if necessary. The correction means corrects the first coordinate point such that the first coordinate point calculated when the input device is directed in a predetermined direction takes a predetermined reference value.