Cap Extend 3 click features four capacitive sensor pads integrated on the PCB, that can sense touch through a variety of different materials. This click can sense touch through plastic, wood, or even metal, thanks to the proprietary Metal over Capacitive technology. All these materials can be used to protect the surface of the PCB and sensor pad traces, allowing implementation of all kinds of human-machine interfaces and seamless integration of the touch-sensitive buttons into various kinds of front panels. The click also features a connector used for connecting to external sensors.