Thank you for the reply!
But what I wanted to know is if a TENS equipment can be used for functional electrical stimulation. What changes from one device to other? Is it the current levels (my device can go up to 100 mA), the wave used (square pulse, symmetrical/assymetrical) or the pulse width and frequency? Or is it just an electrodes position question (if I use the electrodes in a particular location I have a TENS function or if I use them in another location I can have movement production)?

Thankds for the help.