For controlling or monitoring temperatures in enclosed spaces , Super-flat design: 13.9 mm , Installation on 4-hole flush-mounted box or directly on the wall , Mechanical range restriction , Radio interference suppression in accordance with EN 60730 , Temperature range: 5°C to 30°C , With break contact: Up to 10 actuators can be connected , With changeover contact: Up to 5 actuators can be connected , Design:, - PRTR 100: Heating, - PRTR 200: Heating, with temperature reduction, - PRTR 300: Heating or cooling, changeover switch, - PRTR 500: Heating, on/off switch on the side,, with temperature reduction, 'Heating' lamp, - PRTR 700: Heating or cooling, changeover switch, switch, heating/cooling