Suitable for zone 1 and 2, and gas groupings IIC, IIA and II 3 stage alarm with automatic synchronisation UKOOA/PFEER compliant Automatic synchronisation on multi-sounder systems Dual M20 ISO cable gland entries (supplied with one stopping plug) Die cast LM6 aluminium alloy body with UL94V0 flame retardent ABS re-entrant horn Stainless steel mounting brackets For fire applicates the BExS110D24DC is EN54-3 compliant SIL1 suitable