SainSmart USB 4 Channel DC 12V Relay Module
grabcad
This inexpensive USB 12V relay module is a purchase from Amazon, specifically the SainSmart 4-Channel 12V USB Relay Board Module Controller designed for automation and robotics applications. You can find it here: https://www.sainsmart.com/sainsmart-4-channel-12-v-usb-relay-board-module-controller-for-automation-robotics.html ---
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