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The N-8640DS is an IP65, impact resistant IP door station with a separate microphone and speaker, allowing full duplex conversations with Master Stations. The N-8640DS is equipped with one control input and five control outputs (1 relay and 4 open collector) for integration with security or other 3rd party systems. An external speaker output provides .5W @8Ω. External or internal speaker priority is programmable. The N-8640DS may be powered by PoE (recommended).