Type: Other Features: 1,000 foot range with no wires or power connection required Crystal clear, secure 900MHz digital communication Fully secure connection Expansion with additional units (up to 64 per network) can enhance your home's communication to multiple locations Weather-resistant Easy to use - installs in minutes 2-year battery life; requires four AA batteries per unit (not included) Compatible with the following Chamberlain wireless intercoms (models NDIS, NLS1, and NLS2) Parts: 1 year limited Labor: 1 year limited