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The Pelco ERD97P-AUX Alarm/Relay Option Board provides 8 additional relay ouptuts for the ERD97P21-U Pelco-P protocol receiver. The ERD97P21-U receiver comes standard with 1 relay output and with this board installed will have a total of 9 relay outputs. Relay signals are compatible with 24 VDC and 120 VAC relay devices.