ATEX certified for use in Zones 1, 2, 21, and 22Up to 117 dB (nominal) sound output level for wide area notification and alarmInternal volume controlChoice of 32 alarm tonesExternal control of 3 tone stages - (different stage corresponds to different alarm circumstances)IP 66, IP 67 (NEMA 4) marine-grade cast aluminum housingOperating voltages (nominal): 12, 24, 48 VDC, and 115, 230 VACStainless steel mounting bracketContact factory for option part numbers not listed below