Model UTM is a microcontroller-based tone generator capable of producing 32 different tones. Model UTM is the key component of a SelecTone® System or a single SelecTone device. Tone selection is made by setting five DIP switches. Housed in a plastic cover impregnated with stainless steel fibers, the circuitry is shielded from RFI (radio frequency interference) and EMI (electro-magnetic interference). The edge connector allows for quick and simple installation. In addition to working with the entire SelecTone® line of amplified speaker products, Model UTM is compatible with the EM3 Extensio n Module, 300VSC-1 Command Unit, 300VSC-1044SB Command Unit and 300SCW-1 Command Unit. Model UTM provides crisp, clear digital signals that are easily distinguished from the ambient noise of commercial, institutional and industrial environments.