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Put the vest on and start OWO app (on your phone or tablet). Before you start playing, it will automatically ask you to calibrate. At this point, you simply need to adjust the intensity of each sensation in each muscle. Start low and go up until you have the sensation you like!
Yes, you must buy one which will fit you. It must be tight on you so you can feel all of the correct sensations. It is elastic and comfortable, so ordering a tighter one is better if you are between two sizes.