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The 5570M intercom from Edwards Signaling and Security Systems is a two-way communications device available in 120/240VAC, 50/60Hz, and 24VAC/DC. The product is rated for NEMA type 3R installations and for class I div. 2, class II div. 2 and class III hazardous locations. The intercom can be used in a balanced or unbalanced line operation and in a master or satellite mode configuration. Edwards Signaling and Security Systems