Acupuncture or at home electric machine

I am new to chronic pain but am under tons of stress which is making my pain worse. I was thinking about trying acupuncture but it is so expensive so I found this kit of amazon. It is super cheap but other people have reviewed it well. It is a pad you attach to your body and it send electric signals through your skin. The reviews say it looks cheaply made but works great. Anyone have success with acupuncture or this other thing I don't know what is called?

See if you can find out if it's a TENS. I get very good relief from muscle spasms with it. When I have to walk a long distance or drive an hour to my doctors I slap it on before I go. If I forget it I am reminded with awful pain.

I have had NO relief from nerve pain with TENS. My nerve pain starts in my spine and you're not supposed to cross the spine with the pads. My spine problems give me hip, thigh, leg and foot tingling and electric stabs.