The Harvia Fenix FX45-U1-U3-XC is a modern sauna control unit with Wi-Fi capabilities, allowing users to easily manage their sauna experience from a smartphone or tablet. It features an intuitive touch screen interface, enabling precise control of temperature, lighting, and operating time. With its sleek design and seamless connectivity, the Fenix FX45-U1-U3-XC offers convenience and flexibility for an enhanced sauna experience. Please note: Must install the sensor included with the heater per the instructions in the heater manual.