Fig. 2
From: Assistive technologies for pain management in people with amputation: a literature review

The transcutaneous electrical nerve stimulation unit [https://en.wikipedia.org/wiki/Transcutaneous_electrical_nerve_stimulation]
From: Assistive technologies for pain management in people with amputation: a literature review
The transcutaneous electrical nerve stimulation unit [https://en.wikipedia.org/wiki/Transcutaneous_electrical_nerve_stimulation]