It's a machine that you can use to alleviate pain during labor. Pretty much you have these four sticky patches that you place onto your back and it sends a small electrical current to your muscles and when you get a contraction you press the button and it stimulates the muscles. Instead of pain messages you feel like pins and needles tingling. It's the non invasive pain relief that does not affect baby or any monitoring you may need.
Hope it works well for you :) I havent heard of them being used for labor, but my mom has one for arthritis in her knee and it helps her a lot.
Good luck :)
They are pretty popular in australia to try and aid in pain relief. Fingers crossed it does work. :-)