Chamberlain® Wireless Intercoms are the first and only intercoms in the world designed to operate from batteries full-time. This means that they are always on and available, and conserve battery power when not in use. We offer portable units, wall-mount, and flush-mount styles, and each system features up to three years of battery life and 1,000 feet of range. They are the only expandable wireless intercoms available to enhance your communication to multiple locations both inside and outside your home.