Disclosed are techniques and systems to provide a narration of a text in multiple different voices. The protection device includes a housing defining a cavity therein and separated into two chambers, a dirty chamber for propagation of signals before filtering of electromagnetic interference, and a clean chamber, isolated from the dirty chamber, for propagation of signals after filtering. The test adapter has a frame, a shield, and one or more bushings, which provides easy access to contacts, patchcords and modules in the test adapter for troubleshooting, repairs and maintenance. A display means indicates the excursion of rotation of the adjusting muff, and a switch actuates the displays following a predetermined rotational excursion of the adjusting muff.