For me it was a waste of time and money. They light up, but a thin wire and the pattern change works a couple of times and then hangs up. The wires are so thin that you just have to touch the yellow wire with your finger (not to mention the ground. And they change at least the first couple of times and then lock the city without changing again. The wire wrap) was like that thin that all I had to do was pinch the sheath with my fingers and pull it back to expose more wires that didn't require a knife.
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