A method of testing an aircraft video system using a handheld video testing apparatus is described. At one end of the tolerance ring is an outwardly flared guide surface extending axially from the band. A desiccant body is coupled to at least a portion of the plurality of inner walls and absorbs moisture within the inner cavity. The output stage may include a first pass gate operatively coupled between the first differential output and an output of the output stage, a second pass gate operatively coupled between the second differential output and the pass gate enabled latch, and the pass gate enabled latch may be operatively coupled to the output of the output stage. The bottom portions may be separated by a separation. Each of the first and second sound elements is provided with a cone that focuses the sound beam so as to limit interruptions stemming from outside sound sources.