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Product Name: 3 * 4 matrix keyboard / membrane keypad / keyboard MCU expansion

Peel off the back of the keyboard layer of white paper, can be firmly pasted on the surface of the chassis for easy installation.
New 3 * 44 * 4 matrix keyboard, the keyboard is equipped with a good DuPont shell, can be inserted directly microcontroller circuit for external MCU expansion conducive learning keyboard microcontroller peripheral expansion.