Add-On Transmitter for Chamberlain with Intercom and Remote Control, Item# 331704

For use with Chamberlain with Intercom and Remote Control Item# 331704, which can monitor up to 8 transceiver/sensors. The base station distinguishes among transceiver/sensors with a different tone for each location, alerting you to which specific area has activity. Transceiver has voice and remote capability. U.S.A.