Review on SainSmart 101 70 100 2 Channel Relay Module by Paul Mac

Item received on time. When I plugged it into my projects the power lights came on but the relays didn't work. EDIT: After reading other reviews I found that this relay requires 5V. I used it with a particle photon and applied 3.3V to the input. After following the suggested advice I removed the jumper from the JD-VDC and put 5 In Particle on VIN, he works like a champ. Sorry for the first uninformed review.