The present invention relates to target acquisition and related devices, and more particularly to telescopic gunsights and associated equipment used to achieve shooting accuracy at, for example, close ranges, medium ranges and extreme ranges. For example, a wireless network interface may be configured to interface between a wireless communication device and a wireless network. When a calling party calls the subscriber to this privacy screening service, the privacy management system manages the call according to whether the calling party number is known and public, known and private, or unknown. The selection of the reflectometer frequency allows for in use testing without effecting the desired frequencies, as well as minimizing damage to sensitive components within the end equipment devices. Knowing the specific response potential allows the device to identify more reliably when the measured potential corresponds to a myocardial depolarization.