This is a replacment transmitter for your existing WRCLIK receiver. It will work with the Rain only and the Rain Freeze WRFCLIK. If your existing receiver and transmitter has a dangling wire type antenna, this is not compatible and you will need to purchase the full kit.
Once received, if the red LED on the transmitter does not come on, set the sensor in the sun with the vent open all the way. When they are factory tested, they may stay wet in the box until allowed to dry out
Testing and addressing (pairing) cannot be performed until the Hydrostatic disks in the sensor are dry, the test spindle can be pressed and the red LED flashes.
Search online for "WRCLIK Addressing" for easy to follow instrucions with pictures.
Please reach out to us if there are any isuues at all, no need to return, we can get you going!