LNK2WIFI fits LNK-ready ESP-TM2, ESP-ME3, ESP-Me manufactured after November 2, 2016 with the LNK Ready mark, plus ESP-RZXe, LXME2, and LXIVM. It does not add Wi-Fi to RC2 (already built-in) or to pre-2016 ESP-TM / ESP-Modular cabinets. WaterSense needs the controller, LNK2, and a Rain Bird rain sensor — not the module alone.