Federal Signal‘s Model 302GCX SelecTone® Speaker Amplifier is designed to produce tones, digital voice messages and live public address in harsh environments with high ambient noise levels. The rugged speaker cone and projector are constructed of spun aluminum. The amplification circuitry, tone module, and gain control are contained in a housing constructed of die–cast aluminum. All surfaces are sealed with powder–coat paint. Dust– and moisture– proof gaskets provide protection from the elements.