The Harvia Fenix FX30C-U3-XC is a sauna heater control unit with a touch control panel and Wi-Fi connectivity. Fenix provides a modern and intelligent user interface for controlling the heart of the sauna, the heater. The glass screen control panel is easy to install where you want it: in the sauna, the bathroom, or even the living room. The control panel with its Wi-Fi feature enables you to monitor and adjust your sauna settings remotely, ensuring it's always at the right temperature. Please Note: If the sensor comes with the heater, you must install per the instructions in the heater manual.