It has three sensor panels in a plastic housing with a size of 210x140x12mm and is impermeable to splash-water. The sensors can be addressed together, individually or by wiping gesture. All sensor panels can also be addressed by double-click. If you touch a tile e.g., with a plugged device at the back, on the wished sensor panel (A, B or C) a message is written to the bus. Optionally by touching the sensor an acoustic feedback can be output which has a different tone pitch according to the used sensor panel (A:high, B:medium, C:deep). If the device is in programming mode a red LED is visible and a dialing tone is audible. In the cleaning process a tone can be activated optionally, which notify the lock function of the button.The reach of operation through the surface material, behind which the device is plugged is farest 25mm by using ceramics or glass and 20mm by using wood. The sensors are robust against splashwater on the surface material.