Review on 📡 Channel Module Optocoupler Trigger by HiLetgo by Rusty Smith

Works as advertised. I've used several of these for various projects, all have worked well, all are reliable. Everything is clearly marked on the board. This can be caused by 12V or 5V, there are small jumpers to change this, again everything is clearly marked. Isolation is a nice feature, although not strictly necessary in any of the applications I need. The screw terminals hold the 18 gauge stranded wire very securely (you can even connect two if you're careful). I like the LEDs for each relay that light up when the relay is triggered, making it easy to keep track of when setting up complex wiring. much easier. From my experience I can say that they are reliable. I accidentally misconnected some wires and shorted 3 relays. The plastic on my cables melted before I could unplug the power. but the board was not damaged. Some reviewers have complained that there are no instructions, but honestly, if you don't know what +, -, NC, NO, and com are, and if you don't know how to change jumpers, you need a basic electronics course : Directions will not help you. . Everything is marked, the properties are in the description. For less than ten bucks, these things are a steal.