I like them very much, I'm not familiar with DC devices, but I'm satisfied with the performance. They switch minus and plus, which was necessary as there were multiple voltages in my project. The waterproof covers were difficult to install and I don't think they will do anything to make them waterproof? They are simply screwed onto the cup. The screw terminals seemed flimsy to me, but it didn't really matter since I had soldered them anyway. Basically what I needed.