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Amazon.com: Electronics-Salon 2 DPDT Signal Relay Module Board, DC 12V Version, for Arduino Raspberry-Pi 8051 PIC. : Electronics
![Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/710lO84lESL.jpg "Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific")
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