You can replace your ActivLife User Guide for any of our TENS machines. They give you full TENS machine instructions so you can understand how to best use your TENS machine.
A TENS machine of the highest quality, easy to use, light to wear, powerful and very effective for drug-free pain relief, injury healing and muscle strengthening.
Professor Mark I Johnson of Leads University; "Transcutaneous Electrical Nerve Stimulation"; Oxford University Press; 2014
Robertson, Ward, et al: “Electrotherapy Explained - Principles and Practice”; Butterworth Heinemann for Elsevier Health Services; 2006.