The Rain Bird F55420 4-Station Indoor / Outdoor WIFI Irrigation Controller for International Markets Except Australia. It runs at 230V and 50Hz. The industry’s most flexible residential/light commercial irrigation controller that supports flow monitoring, LNK2 WiFi, and up to 22 stations. With 4 to 22 stations, the ESP-ME3 provides the station count options customers need. Install the same controller on residential and light commercial sites. Add station modules when expanding irrigation without removing or even powering down the controller.