One of the coils has stopped working. Is using one coil going to be at all effective?

I can not answer this. But I have read that the wires going into the coil is delicate, so be careful not to tug. Some people on here have soldered the wire back into the coil and it works again. But the quad coils seem much more effective and it covers a larger area. I use it mostly for my low back and stomach issues.

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