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These units are called tenns units and provide a short duration pulse of ac current through the muscle. You will find penty of circuits on the net regarding this type of equipment . They do not make muscles big they exercise the muscle to give relief from pain and to tone the muscle up.
Think twice before use this device on your body. I have made it at 1986 and some information has stopped me.
First: This device used pulses with amplitude up to 60 V and you will have some blood electrolysis.
Second: The points of acupuncture in your skin have much less electrical resistance then other skin. So the current will go directly to these important stimulation points and you can get big shock in unforeseen part of your organism.