The D1xS1R is a performance certified alarm horn sounder with a compact, omni-directional horn and a sound output of up to 101dB(A). The robust Type 4/4X, IP66 marine grade, corrosion proof aluminum enclosure is approved for Class I & II Div 1, Zone 1 & 20, IECEx and ATEx Zone 1 & 2 explosion proof signaling applications.