All 3 strands of lights work but the power source did not work. Luckiy I was replacing a strand of lights and didn't need the power cords. But would have been upset if I'd needed them. I know you get these things as returned items as a liquidator but you should verify the items work before selling them. You could have sold them as a set with power cord not working. Lots of us need replacement strips and wouldn't have cared because we're patching them into another existing set.