1.Use the latest technology ,microcomputer control,safe,convenient and fast. 2.It has 9 kinds of intensity for different treatment.Lower level is used on spot and freckle.Strong level is used on mole and skin tags. 3.Remove spot without blooding. 4.Stainless steel spot pen is non-toxic, hygienic, uneasy to rust for a secure use. 5.LCD display shows how much the electricity and the levels of intensity. 6.Charge directly by USB line, easy carry and easy operate. High capacity battery. 7.It can work more than 5 hours after charging.