This high frequency and galvanic two in one instrument combines of high frequency and galvanic current functions. Perfect for deep skin cleansing treatments. The mushroom shape electro probe should be used on larger surface areas of the skin such as forehead, face, neck. The ball shaped probe gives off better results if you use it on areas such as the clients nose and around the eyes as this will give of better results, the straight probe is beneficial if used for an indirect treatment. Finally the last probe is used for medium body parts such as the chin.