This is a junk item. It does not work even when the power cord is plugged in and the power is turned on. The back cover is not included. Please purchase only if you understand and accept the above. Since this is a junk item, returns are not accepted. Hair Dryer ReFa BEAUTECH DRYER SMART White The following is a product description: This hair dryer is equipped with a powerful "HPD motor" jointly developed with motor manufacturer Nidec. It achieves quick drying with the "High-Speed High-Pressure Aero System." It is equipped with a "Sensing Program" that approaches the scalp and hair ends at the appropriate temperature, preventing the scalp from feeling under-dried and the hair ends from over-drying. It generates "Hydro Ion" and delivers it thoroughly to the entire hair. The weight of the main unit has been reduced to approximately 330g, about 45% of the conventional model. Management Number: M6