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Membrane LED Keypad + extras : ID 1333 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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1*2 3 4 5 Key Button Membrane Switch 3*4 4x5 Matrix Array Keyboard 1x6 Keypad With Led Control Panel Pad Diy Kit For Arduino - Integrated Circuits - AliExpress
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Basics: Project 022n 4x4 matrix membrane and rigid keypads, LEDs, active piezo buzzer,LCD1602 I2C mo at Acoptex.com / ACOPTEX.COM
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