Review on ⚡ DC 12V-36V Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module Output 6-60V, Low Power Disconnection (2-Pack) by Cris Walton

I bought 2 of these 4 months ago and they were perfect. Exactly as pictured and works exactly as described. I just bought 4 more and now it's a completely different product that just doesn't work. The picture shows that this is a completely different board, some SMDs have been moved and some are even missing (look at your R2 and R3). None of the pass-through components are the same, and most of them now look like cheap white-label knockoffs. Given the price, all of this would be forgivable IF they worked and didn't. The cut off voltage is set at 12.0V and if you try to change it it just corrects the voltmeter reading. The return difference is set to 2.0V and if you try to set it you'll get a screen where you can choose one of 11 integers, changing which does absolutely nothing. TL; DR - You tried replacing the advertised product with a cheap copy and failed miserably. That does not work.