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This 4*4 membrane keyboard can be used with various development boards as an external input device for the development board. It only takes 8 standard IO ports, and can realize 16 keys scans and independent input. The interface is 2.54mm female socket, which can be directly inserted into the pin header. It is suitable for development boards such as 51 MCU, STM32, Arduino. And the back of the keyboard is a self-adhesive design that can be applied to a smooth surface.