PTC Heater is a kind of new surface-insulated type PTC heater. It is called all-purpose MDII PTC heater by fixing two metal electrodes with two leads on both sides of general PTC element. Basically, an insulated film is fixed on metal electrodes. The Simple-structure heater gives out constant-temperature heat and does not need any additional temperature applications. The high insulation-intension heater has many advantage such as security, giving out heat continuously and holding steady power, being used in a wide range of voltage and so on.