Review on Enhance Your UNO R3 with the HiLetgo 5V 4 Channel Relay Shield: Efficiently Control Four Channels by Adam Bates

Should have read the reviews. quality is bad. The pins are not standard thickness and bend easily. All were damaged, most likely during packaging. The box looked ok. Solder connections land on the USB connector, causing a short circuit. The only reason I'm giving 2 stars is because it technically works and for $7 would be enough to dyno test a prototype, but I had to manually bend all the pins back to get them straight and I would have to isolate the USB port. I will not buy again, I will look elsewhere for an end use product.