1、It is completely silent, adopts fluorine‑free design, and there is no noise when working. The nonslip silicone foot pad is stable and not easy to slip off. 2、Energy saving and power saving, 5V safe power supply, suitable for student dormitories, office computers, and home life. The USB plug provides for convenience and is convenient to carry to meet various places. 3、Semiconductor refrigeration system, high efficiency refrigeration technology to improve the speed of cold preservation / heat preservation, low power consumption and long lasting. 4、It is necessary to keep warm in winter and cold in summer. Carry a small refrigerator with you, and the USB port supports power bank power supply. 5、One‑button start, sensitive switch and long service life. In cold state, the indicator light is green when plugged in; in the state of heat preservation; the indicator light is red when plugged in.