Name : DIGIONN 4 Pcs 4X4 Matrix Array 16 Key Membrane Switch Keypad 8 Pin Keyboard (Keypad Membrane) Compatible with Aurdino, AVR, PIC Raspberry PI ESP8266 and Development Boards.

Multipack : 4

Digionn 4x4 matrix array 16 Key Membrane Switch key board Micro controller. Punch in your secret key into this numeric matrix keypad. 4x4 Matrix Keypad Membrane type keypad has 16 buttons, arranged in a 4x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 8 micro controller pins (4 columns and 4 rows) to scan through the pad. Easy communication with any microcontroller.