The ST200 Base Transmitter features 16 user selectable frequencies controlled by a front mounted selector knob, a headphone jack with adjustable level for input signal monitoring, and a peak reading LED display for visual input monitoring. On the back of the unit is a balanced XLR-3F with selectable mic, line, and 70 volt input options, as well as an unbalanced ¼" input. An input attenuator and hi/low RF power switch are additional back panel features.