Electronic flush-mounted room temperature controller for controlling or monitoring temperatures in living rooms, offices and hotels. Suitable for all common switch ranges. Polar white glossy, 55x55 cover with button. Suitable for water-based heating systems. Completely silent thanks to the use of a triac switch, in contrast to relays or bimetal. Automatically switchable via a change-over input, therefore can be used for heating and cooling. When the clock terminal is connected, the temperature is regulated to a temperature 3.5K lower and increased by 3.5K in cooling mode. With LED status displays. Adjustable range restriction in the setting button to reduce heating costs. A captive screw with threaded insert for fastening the housing cover and practical plug-in terminals make installation easier. Installation in a 55 mm flush-mounted box.