Endurance: Portable neck fan endurance, three-level adjustable wind speed, super quiet, light and compact, equipped with power LED display, say goodbye to the problem of power failure. New improved cooling and heating principle: New improved cooling and heating principle, intelligent chip temperature control, with thermal conductive chip in aviation aluminum grade, heating and cooling performance is more powerful. Design: The matching part of this USB neck fan is ergonomically designed, suitable for all neck types and not easy to detach. The bladeless neck fan does not feel oppressive when worn for long periods. Operation: The temperature is transferred from the body through the throat to the brain. The newly developed neck fan can eliminate neck heat and thus achieve the cooling effect. Smart chip replaces traditional motor: Smart chip replaces traditional motor with different design principles to avoid buzzing noise caused by the internal motor, fan blade and air duct of the traditional neck fan. 5000mAh high-performance polymer lithium battery, improved type C fast charging technology, can cool easily and relieve heat in 4 hours