Micro current (Beck) usually runs at 4hz, the beck blood electrification frequency. Zappers run from 15hz to 30,000hz. Beck focuses on electrifying the blood by placing the electrodes over arteries. Zappers rely on mainly on copper pipes and sometimes copper footpads for more effective zapping the whole body. You can buy portable zappers like the terminator that you can wear under you shirt sleeve but they are not as fast and effective as the copper pipes. Zappers are probably more effective for killing parasites
because of the circuit design. There are more technical differences but I am not a big techy.I just know some of the basics.
PS I own and use both the zapper and Beck units. Personally I would buy a good zapper with foot pads if you are trying to get rid of an infection.