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3*4 4*4 Matrix Switch Keyboard Keypad Array Module ABS Plastic Keys 4x4 3x4 12 16 Key Button Membrane Switch DIY Kit for Arduino|Integrated Circuits| - AliExpress
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10pcs 4x4 3X4 Matrix Array 16 Keys 4*4 3*4 Switch Keypad Keyboard Module for Arduino|Integrated Circuits| - AliExpress
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