The inventors of Livia call it "the off switch for menstrual pain."
The system consists of a small box that clips onto a belt or fits inside a pocket, as well as gel pads that contain two electrodes. These send electrical pulses into the body that block pain receptors. The Times of Israel explains:
[...] Livia transmits a pulse that keeps the nerves “busy,” so that pain messages that should be accepted by nerve receptors and transmitted to the brain — which concludes that a woman is in pain — aren’t. With those messages lost in transmission, there is no feeling of pain.
Does it work? Last month, Chelsea Frisbie of Mashable tried Livia. She says that it reduced her pain:
I didn't feel that much of a difference when I placed the Livia pads on my lower abdomen, because that's not where I get cramps. Where I do have cramps would turn this device into more of a Brazilian wax machine than a cramp-stopper, due to the gel pads.
I do have some pretty gnarly lower back pain nearly all of the time, but during my period it gets more intense — as in, bring-a-heating-pad-to-work-intense.
While wearing the device, I will say my back felt much better. I found myself wearing it all day, and even after my week was up because of how much better it made my back feel.
-via Debby Witt