Canatek CBWXS2-SUB (Two Port) Expansion Transmitters Without Sensors
These Canatek wireless expansion transmitter systems communicate with any Canatek wireless gateway. They are available for use with one, two or three sensors of your choice which are purchased separately. Each expansion kit comes with the transmitter, a plug in ac adapter, and an installation accessory kit. Simply select the sensors you require which best suit your requirements.