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Chamberlain NDIS Wireless Doorbell & Intercom SystemType: Other Features: Designed for use as a wireless doorbell and intercom for residential, as well as commercial applications 1,000 foot range with no wires or power connection required Crystal clear, secure 900MHz digital communication Weather-resistant (doorbell unit) Easy to use - installs in minutes Expansion with additional units (up to 64 per network) can enhance your home's communication to multiple locations 2-year battery life; requires four AA batteries per unit (not included) Compatible with the following Chamberlain wireless intercoms (models NLS1, NLS2, and NTD2) Parts: 1 year limited Labor: 1 year limited ... Read More »