The original intention of the design is to make a detector project with simple installation and low cost. At that time, many versions were made, but by mistake, I chose this model with auxiliary angle draft, and then studied the process for two months. It cost hundreds of thousands of dollars to open the mold. Although it was opened, the effect was not ideal. Fortunately, the product itself was not a high-end positioning, so it went on the market. Fragmented as the company's main products have also been sold for several years, which is the first serious mass-produced product since the official work.