This Capacitive Touch Shield has 9 build-on capacitive touch pads, and the other 3 electrode for further usage. With this shield you can have a total of 12 touch sensitive buttons. This Shield uses the MPR121 which is a great way to build simple capacitive touch interfaces using the I2C communication, and now it’s even easier to incorporate into your Arduino projects with the touch shield. An on-board logic level converter allows it to work with 5V and 3.3V Arduino boards and a LED to show you the power status. Compares to other touch shield that using digital pins, this shield uses less pins, which allows more pins left for other usage.