UKU Wi-Fi sauna controller makes sauna heating very easy and comfortable. With UKU you can heat your sauna on the spot or do it from your phone through HUUM mobile app. (For HUUM sauna heaters over 11kw and up to 18kW, an UKU Ext Box is required.). Sleek Black control display panel For heaters up to 18kW (over 11kW requires extension box) Settable on/off, time, temperature, and delay Settable temperature range of 122-230F Delayed start up to 48hrs in advance Built-in Wi-Fi interface for HUUM mobile app 6 Language options: English, German, Russian, Italian, Finnish, and Estonian Notification when set temperature is reached Inside/outside sauna room installation Available decorative control display panels Displays set temperature and room temperature Door sensor to keep the heat inside the room Remotely located main control module Connects to lights and ventilation Black control display panel, 4.13" x 2.17" x 0.87" Main control module, 5.59" x 3.54" x 2.28" Control display panel cable, 9.84', 22AWG Temperature sensor cable, 16.4', 24AWG Door sensor cable, 16.4', 24AWG Installation and operation manual