To provide a thermal-transfer sheet having a back layer that can be prepared without heat treatment such as aging and is superior in heat resistance and sliding property, and has no such defect of printed images as wrinkling and tailing during printing. Solder pads are disposed on an opposite side of the substrate. The bellows assembly is connected to the air conditioner vent opening on the dash of the vehicle. Additionally, the present invention can prevent the transformer from being saturated due to magnetic leakage, inductance, and stored energies released or eliminated from the transformer.