The KNX Smart 55 room temperature controller in matt black offers a color display, temperature/humidity sensor and 4 inputs. It fits in switch boxes and is compatible with various switch programs such as GIRA E2, BERKER B3/B7, JUNG A550 or MERTEN M-Pure. The active color display shows functions and status, with adjustable background color and display brightness. It regulates the room temperature with a measuring range of -10 to +50 °C and offers various controller types. The setpoint shift is carried out using separate buttons, and there are options for setting the setpoint. It saves setpoints in the event of a bus voltage failure and offers limit values, frost alarm and switching the operating mode via bit/byte objects. A temperature and humidity sensor with dew point calculation, messages when the comfort zone is left, and 4 binary inputs for buttons, switches or window contacts are also available. The ventilation control is manual or automatic.