While working,Have you ever been looking for a drink cooler cup that would heat from cool for ice tea maker? The cooler mug is there to keep your beverages instantly cold and at the same temperature. When use this water cooler dispenser,it will bring you out of fatigue in an instant. It's a mini fridge,small size and silent. Will not take up space and will not affect your work. While traveling, Take the car refrigerator to have the chilled drinks all the way around or keep your coffee cool while driving. Wide use,multifunction, cooling drinks can be applied to beer, cans and ice cream other conductive product. Specification: Enter: DC5V==2A Suitable for cups: Flat-bottomed metal cups below 75mm in diameter Usb fridge coaster size: 150*150*50mm Use 9V power supply, the cooling and heating effect were better Packing List: 1x Can cooling coaster 1x 9V power supply 1X User manual TIPS: 1.When using USB, this product is widely suitable for power supply of devices above 5V 2A matching the USB port of various types of mobile phone chargers. Please use a 9V/2A power supply for external power supply! ! ! 2.This product is directly inserted into the USB interface of the computer, and the use of related auxiliary equipment such as the relevant USB hub of the HUB will reduce the performance or cause the equipment to be unusable.