As product tester you get before things that you have never seen before. The OMRON E4 is the luxury version of the muscle-tone-performance demands at home. It is a defie with the same principle, be carried out with the also spectacular resuscitation in the emergency department. With the difference that the voltage pulses "something" are lower. There are people like my wife who hate everything that has to do with electricity, like the plague. If you also belong to it, then my advice: Stay away! Here really are the muscle and nerves with "current" stimulated, that they imagine to feel flows. In reality, there are only voltage pulses that cause contractions or muscle tremors. You can see it as well as vice versa: it is fun to hang from the electrodes, and to let a little shake, or to induce a mild subcutaneous tremors. I am chronically tense, I have constantly "back"! I think it's great that you can do in such a straightforward manner something about it. The Long Life pads Man stuck left and right on the neck, or the loins, and look for the right program. There is a zone selection, but before I prefer to "method" select. The zone selection is as it were the right mix of methods. I think the smallpox / tapping on the neck very suitable (Program 10) and the gentle Roam for the lumbar (Program 12). Program 11 and 13 are not bad either. The intensity of the programs it adjusts to a cog itself, depending on how much is still just pleasant. In the area of pain you should not go. There is also the Hyper Mode, as the bar is much higher, and you get really offer what. Is what for athletes or masochists ... Important: these treatments are not imperceptible radiation, or the like. The device also provides no heat, or magnetic mischief. Please no Verwechlungen! This is an external involuntary stimulation of the muscles. Ie if it does not "twitches" or "tingling", then you have either too thick coat, or they have the intensity is not high enough. Conclusion: fun, useful, and easy to use with a little patience. People with back problems, so the typical desk-invalids should have such a device in the house. PS: No idea how long the pads with the electrodes, they exist naturally as an accessory. Costs about 20. So some medical electrode can also clip it naturally.