Model 350WBX (AC current) Vibratone® horn produces sound by the electro-mechanical vibration of a stainless-steel diaphragm. The horn mechanism with diaphragm is attached to the grille. The water- and dust-tight back box is ideal for indoor or outdoor use. The model 350WBX is available in 120 or 240VAC for 50/60Hz. Its sound output level is 100dBA nominal at ten feet (110 dBA at 1 m). This hazardous location horn accommodates surface, flush or semi-flush mounting on walls, panels and in cabinets. The model 350WBX features a die-cast zinc housing with a corrosion-resistant polyurethane finish. The rugged outer grille resists vandalism without reducing sound output. The 350WBX is fused and utilizes a terminal block connection. The 350WBX is approved for class I, division 2, groups A, B, C and D, class II, division 2, groups F and G and class III.