Review on 🚀 Enhanced Performance: HiLetgo Channel Isolated Optocoupler Trigger for Optimal Signal Transmission by Matt Heringer

I'm not sure if out of all the bad batches I got just one bad batch or something. The first block gets stuck in the normally open state, the power indicator is on, as well as the normally open relay 2 when only power is connected. It doesn't matter if the signal on input 1 or input 2 is high or low with the jumper set, nothing changes. To deceive. OK, I think it could happen. Even if it's two packs, I can continue with my project. I open the second relay, plus and minus power, and inputs 1 and 2 are soldered in the air almost 1 cm above the board. There is physical space underneath, and in2 is physically damaged where the screw isn't turning. I must have been terribly unlucky but I can't wait, I have to walk to the micro center and buy locally. I would look for another supplier or product if reliable delivery and correct operation is important to you.