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Amazon.com: 4-Channel Relay Module DC 24V with Optocoupler Isolation H/L high/Low Level Triger for Arduino : Industrial & Scientific
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![Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific](https://images-na.ssl-images-amazon.com/images/I/41VWgkcgkaL._SY445_SX342_QL70_ML2_.jpg "Arduino 4 Relays Shield [A000110]: Amazon.com: Industrial & Scientific")
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Amazon.com: 5V 1 2 4 8 Channel Relay Module with optocoupler. Relay Output 1 2 4 8 Way Relay Module for arduino in Stock (1 Channel Relay) : Industrial & Scientific
