That's the claim of this handy device from U.K. company Maplin Electronics, which says the wonder gadget is "fully approved and certificated" (though by whom, we don't know). Whatever it does, it can be adjusted in "12 pre-set programs" and "2-channel user-defined programs for individual needs." We're sold!
And in case you were wondering: Red Ferret informs us that TENS stands for "Transcutaneous Electrical Nerve Stimulation." Of course.