The process limitation of sheet metal material is relatively large, and the shape is relatively large. Most of them are stamping, bending, welding and polishing. However, the large-volume manufacturing cost is relatively low and the shipment is fast, so this scheme is more in a simple and high-end direction, and the usage method is also simple and clear, which is convenient to observe the light feedback of water temperature. A scheme for OEM OEM OEM is very good in market feedback!