Features Adopts of PTC ceramic heating element and aluminum tube, Low thermal resistance, high heat transfer efficiency. This product is a electric heater with automatic constant temperature and energy saving.Made of high quality material, with long serving life. This PTC ceramic air heater has the characteristic of high security, and surface insulation. With mounting hole, easy installation.The le-ad material adopts high temperature resistance wire, safe for use. Application: air conditioner, electric heater, instrument, general appliance, air curtain machine, humidifier. Specifications:Heat material: PTCVoltage: 220V Power: 300W Size: 12 x 6.5cm / 4.72 x 2.56in (ripple length of 76mm)Weight: 150g Package included:1 x Ceramic Air Heater Note:  No need to distinguish "Positive pole"and "negative pole Package List