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Pertronic PSSB501 is a 100V Line Speaker (1.1 W max) and line transformer mounted in a purpose-moulded plastic aesthetically pleasing acoustic enclosure. When used in conjunction with the Pertronic 20W and 50W 100V line Amplifiers it provides a cost effective solution for speaker based building evacuation systems that must comply with the NZS 4512:2003 and AS 2220 standards.