The Sentido Bus Coupler for KNX is for a four way touch sensor. By touching each of the four touch sensitive areas you can use KNX to execute a range of functions including switching, dimming, operating blinds, activating scenes, etc. Touching a touch sensitive area will give a visual feedback by means of lighting up the central RGB LED which can also be controlled by KNX to provide a visual feedback of statuses. It can also be used to illuminate the switch in the dark. The Sentido switch uses the patented Multitouch technology, touching more than one area at the same time activates an additional function. The Sentido switch has to be used in combination with the Sentido and Enzo front covers, either four-way or two-way.