Two Way Wireless intercom

Two way wireless intercom runs on AA batteries last a long time like a month based on usage Chamberlain NLS2 Wireless Portable Intercom-Double Unit Indoor portable intercoms offer convenient, expandable communication inside and outside your home Crystal clear, secure 900MHz digital communication 1,000 foot range with no wires or power connection required Advance features include voice activation and monitor mode Compatible with the following Chamberlain wireless intercoms (models NDIS, NTD2, and NLS1)