Bought to connect my 300wh Blüti power station to a 100w Renogy solar panel. Bluetti didn't have anything to attach to a pigtail from a solar panel. I was planning to go hiking two days after this arrival, so it should have worked. One of the two ends of the connector in the box fit into the Bluetti connector and I was ready to race. I'm on this hike right now and haven't had any issues. No reverse polarity as some have reported. Seems to be set correctly, at least for Bluetti.