*PLUMBERSSTOCK EXPERT* responded:
Hi, there! Thank you for taking interest in our Broan-NuTone NM200WH intercom master station. This intercom master station is a modern upgrade from the Nutone Intercom 2561 which is a vintage model. The Broan-NuTone NM200WH intercom master station features new and improved functions from the previous model mentioned. Features like digitalized display, support for 15 remote stations, and more of which you can read at this operating instructions manual. If you're interested, please feel free to click "Add to Cart". Enter your zip code on the next page and you're all set. Hope this helps. Thank you and we hope to see you again here at PlumbersStock.com!