It did the job, sort of
The batteries died after an hour of labor - thankfully the nurses at the hospital brought me some new ones. Also, the unit kept turning off unexpectedly. I had to scramble to turn it back on during contractions throughout labor.
That said, I delivered with only this TENS unit for pain management - no drugs! It did the trick.
(Second baby - unit was on for about 5-6 hours, 1 hour of pushing.)