Federal Signal's SelecTone® model 300 is a lightweight and compact, solid-state amplified speaker designed to amplify a pre-selected tone over existing ambient noises. The speaker cone and projector are made of spun aluminum. The internal amplifier circuitry and tone module are contained in a housing of die cast aluminum. Dust and moisture-proof gasketing provides protection from the elements. All external components are sealed with powder-coat paint. SelecTone® amplified speakers are used individually or as part of a plant wide emergency notification system. The model UTM universal tone module, with 32 tones, or the TM33 custom tone module is plugged into a single SelecTone® amplified speaker for stand-alone use or into a SelecTone® command unit for plant wide signaling. Model 300 speaker/amplifiers are ideally suited for full output tone signaling where voice paging is not a requirement. Typical applications include emergency warning, start-and dismissal, general alarm, smelters and cranes.