- 1000 foot range with no wires or power connection required- Crystal clear secure 900MHz digital munication- High-tech design and modern look blends in with today"s tech-friendly contemporary homes- Improved controls makes it easy to operate- Advanced features include voice activation and monitor mode- Broadcast to all channels simultaneously or speak to one party with Secured Link- Single or multi-channel munication- Expansion with additional units (up to 64 per work) can enhance your home"s munication to multiple locations- 2-year battery life; requires four AA batteries per unit (not included)- 1-year manufacturer"s warranty- Compatible with the following Chamberlain® wireless inters (models NDIS NTD2 and NLS1)- Power adapter is optional and each unit requires (4) AA batteries not includedCHNLS2