In the System M design. Comfortable control unit with 4 control buttons, operating and status display and label field. The operating display can also be used as an orientation light. With room temperature controller and display. With 5 red LEDs. The room temperature controller can be used for heating and cooling with continuously adjustable KNX actuators or for controlling switching actuators and heating actuators. With white backlit display to show e.g. time, date, temperature and operating mode. Menu for setting standard operating modes, setpoint, working day/non-working day (external control), display mode, time, switching times and brightness of the display. The buttons can be freely parameterized as a pair of buttons (two-surface) or as individual buttonsxx With integrated bus coupler. The bus is connected via a bus connection terminal. Software functions KNX functions Button switching, toggle, dimming, blinds (relative or absolute), edges trigger 1, 2, 4 or 8-bit telegrams (distinction between short/long operation). Edges with 2-byte telegrams (distinction between short/long operation), 8-bit slider, scene recall, scene storage, lock function, time control with synchronization, reporting function. Cyclic reading of external temperature value, fan control, operating modes, setpoint shift. Room temperature controller functions Controller type 2-point control, continuous PI control, switching PI control (PWM). Output Continuous in the range 0-100% or switching ON/OFF. Controller mode -Heating with one controller output. Cooling with one controller output. Heating and cooling with separate controller outputs. Heating and cooling with one controller output. 2-stage heating with 2 controller outputs. 2-stage cooling with 2 controller outputs. 2-stage heating and cooling with 4 controller outputs. Operating modes comfort, comfort extension, standby, night reduction, frost/heat protection. Shifting of all setpoints. Saving of all setpoint temperatures and operating modes on reset. Monitoring of external temperature. Additional output of the control variable as a 1-byte value with PWM. Reporting function for actual temperature, valve protection functionxx scene function. Operation menu. Scope of delivery With bus connection terminal and support plate. With screw for dismantling protection. With plaster protection cover. Material: brilliant thermoplastic. Color: glossy polar white.