The present invention discloses a high voltage device and a manufacturing method thereof. Embodiments of the invention use an iterative algorithm to transform a collection of pairwise links to groups of records that correspond to the same entity. The AV or PV interval value at which R-wave sensing occurs is stored in memory as the atrioventricular conduction time. A mechanism is also described for limiting the accuracy of decrypted location data made available to a service system. In response to this determination being made, a communication may be transmitted to a designated device, recipient or network location.