Yuyao Keyang Refrigeration Technology Co., Ltd. Since its establishment in 2002, with unique advantages and mature and advanced technology, we have professionally developed and produced energy-saving and environmentally friendly “KOOLYOUNG” brand passive insulation boxes, insulation bucket series, DC freezer series, car compressor refrigerator series, and outdoor portable audio series. This series of products has safe and reliable performance, a new design, easy to carry, and convenient to use functions. It has been widely used in fields such as food preservation, medical refrigeration, fast food delivery, refrigerated transportation, and is also a good companion for entertainment and leisure such as travel, outings, camping, fishing, etc. It has been highly praised by customers both domestically and internationally.