TENs box to Arduino

Can anyone please give me some insight on hacking a TENs box? I am interested in controlling it with an arduino uno.

Any feedback would be greatly appreciated.

Thanks!!!

most of us do not offer any advise when interfacing certified medical equipment other than, do not try to alter certified medical equipment.

so , that said, do not try to alter certified medical equipment.

On the other hand, TENS boxes are considered to be hoaxes by a large number of reasonable people, including most western medical professionals.

Thanks for the advice. But I am hacking it anyways. Is there any other tips out there?