Qingdao Sanyi brand. Letter of the unit. This company produces household electric blanket by the National Testing Center of the technical indicators are standard. Original fever, outer spiral winding and extrusion of new technology. With good insulation, high tensile strength, long service life. Double-pass double-off control switch, divided into high and low temperature in two steps can be adjusted, heat is large, small power consumption, temperature uniformity, appearance and other characteristics that quality and cheap price, volume discount.