Self sticking keypad in a 4 x 4 matrix and a size of 77 (H) x 69 (W) mm. The lifespan of the tactile switches is more than 1 million actions, the max. operation voltage is 35VDC. The contact resistance is less than 500 Ohm, a current of 100mA per switch element should not be exceeded. A debouncing of >5ms is recommended. A library, supporting this keypad, is available for example within the Arduino IDE. The keypad will be shipped together with a 8-pin header strip.