The TouchKey 2 Click Board™ has four capacitive pads powered by Microchip's ATtiny817 which has an integrated touch QTouch' controller.
The Click Board™ is designed to run on a 3.3V power supply. The four LEDs on-board the TouchKey 2 Click Board™ indicate when the Key (Pad) is pressed. TouchKey 2 Click Board™ communicates with the target microcontroller over the UART interface.