Wireless Annunciator System, Indoor/Outdoor, Detection Range: 50 ft. Distance, 17 ft. Fan Pattern, Transmission Range: 2000 ft, Surface Mount, Color: White, Requires: 9V Alkaline Battery. Includes: TD-20U Sensor Transmitter and RC-20U Chime Box w/Relay Receiver. This kit can be used with additional Transmitter item TD-20U.
Sensor Transmitter, Wireless, Indoor/Outdoor, Detection Range: 50 ft. Distance, 17 ft. Fan Pattern, Transmission Range: 2000 ft, Surface Mount, Color: White, Requires: 9V Alkaline Battery. For use with 2000 Series Wireless Device and Compatible with RC-20U Chime Box w/Relay and RG-20U Relay Receiver. Can also be added to RC TD-20U for an added Transmitter.