Tenns Units
The Tenns unit I have operates on two reechargable AA batteries. It doesn't operat very long and requires constant upping the adjustment to get relief and finally give up in less than an hour. Do the...
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I couldn't find the exact one that I have but look at these. I bought mine from this company and it works on ac power and battery (I have not tried it on battery). The interferential units go deeper and work better IMHO. Interferential Tens
