LNK2WIFI is Rain Bird's plug-in Wi-Fi module. It turns a LNK-ready ESP-TM2, ESP-ME3, ESP-Me (manufactured after November 2, 2016), ESP-RZXe, LXME2, or LXIVM into a cloud-connected controller on the free Rain Bird app — weather-based run times, remote start/stop, alerts, and shared access with the landscape contractor.