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5V 2 Channel Relay Module Opto-isolated, for Raspberry Arduino, Pi, PIC, AVR ARM

5V Two 2 Channel Relay Module With optocoupler For PIC AVR DSP ARM Arduino

One Channel KY-019 5V Relay Module Board Shield For PIC AVR DSP ARM Arduino

1/2/4 Channel 3V 3.3V Relay Module Low Level Trigger Relay For Arduino

5V Four 4 Channel Relay Module With optocoupler For PIC AVR DSP ARM Arduino UK