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The Valcom V-9936A is a 6-line audible ringer unit that connects directly to a trunk or station port on a phone system. The Valcom V-9936A provides ringing over paging speakers, contact closure to activate loud bells during ringing, a built-in warble tone generator, interrupter, volume control, and punch down block. Up to 4 units can connected together to support up to 24 lines. The output impedance is 8-phms and has 90 Vac ring or dry contact closure activation.