Tang Feng series is the latest hand-pushed mobile large air volume fan developed by Shalep company. The four-wheel design can move freely indoors and outdoors, and the fan blade is driven by PMSM permanent magnet synchronous motor to output large and stable air volume; In the sultry and irritable environment of hot summer, Tang wind can bring the cooling effect equivalent to more than 30 small fans; The fan as a whole is lightweight and durable, and can be applied to most places where the environment is more complex.