Electromechanical flush-mounted room temperature controller for regulating or monitoring temperatures in offices, living spaces, and hotels. Compatible with all common switch programs when used with the appropriate cover set. Suitable for all types of heating. The thermal feedback achieves a very precise switching differential. The range narrowing located under the adjustment knob allows for modification of the adjustment range. VDE tested. Simple electrical connection without screws. New terminals for easy and quick installation. Simplified wiring through color coding of the terminals. Time savings through a modular principle: practical sequence of assembly for the controller, frame, and cover. Compact installation volume for comfortable and quick mounting in the flush-mounted box. Temperature control is possible even without a cover. Closed design. Optimal screw retention. The color of the base is anthracite, and the color of the top corresponds to the chosen cover set.