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The NDR-40 is a 40 call master station from Aiphone which features selective outputs for high quality and reliable operation. The NDR-40 master comes with a push-to-talk button, additional contact capability, a lamp memory call-in function, as well as NEM compatibility, and a 500mW max communication output. The NDR-40 master also features a selective door release, a 420’ wiring distance, and is extremely user friendly for effortless operation. This master station can be easily installed, and can deliver a reliable communication system for any working commercial environment.