4 buttons touch keypad is a very useful, multi purpose product that can be used with many microcontroller boards especially Arduino platform.
The board operates between 2.5 V and 5.5 V. This means it is possible to use on 3.3 V systems like Raspberry Pi and 5 V systems like Arduino.
There are 6 pins on the board. These pins are supply voltage, ground voltage and outputs for each button. You may add touch keypad feature to your DIY projects with this useful board.