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Old price 4.34 €
Can be inserted directly into Arduino uno mega2560,Ideal for linking up to your  Arduino UNO Mini Nano Mega2560 Breadboard etc,or others MCU ( AVR STM32 ARM PIC AT89C51 STC MSP430 STM8 FPGA CPLD etc.) 
4-button Common Cathode key module .
2 " GND K1 K2 K3 K4" 4 PIN OUT  2.54mm
3 Size: 12.7MM x 33MM.
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