Capacitive buttons, sliders, wheels and proximity (BSWP), also known as mechanical button replacement (MBR) is a human machine interface technology using capacitivesensing techniques. Capacitive BSWP uses touch-sensing electrodes that can be built into an existing PCB allowing for different shapes and sizes, thinner and more elegant designs without added cost. As the electrodes are not mechanical and mounted under plastic, glass or metal overlays, they are more reliable and easy to maintain.