This is a neck fan project with refrigeration. It was carried out for 19 years. At that time, in order to be able to go on the market quickly, the public ordinary fan head was directly purchased. It seemed that the cost was more than 1 yuan, saving part of the mold cost. In the end, it didn't sell much, because after the season, it fell silent. A year later, the appearance was improved again, and the fan head was replaced with turbine blades, which can ensure that the hair will not be rolled in while the wind is out. Seems to have sold a lot of PS: modeling software rhinoceros 5 keyshot6 9 pscc