Coffee Warmer Constant Temperature Coasters Cooling Heating USB Warmer Cooler for Milk Tea Coffee Mug White

USB Powered: This mug warmer is powered by USB, and supports multiple power supply methods. It can be used by power bank, computer, and charging .
Universal For Various Cups: It can be fit most cups, such glass cup, stainless steel cup, Ceramic cup etc. For better results, we recommend placing a lid over the mug will also help retain heat.
Cooling and Heating: The dual use mug warmer can not only heat but also cool. It can also be used for water cooling in summer. One button to switch functions, simple operation.
Rapid Heat Dissipation: The coffee warmer with large exhaust holes can dissipate heat quickly and prolong its service life. All day use without pressure.
For Winter: Coffee warmer keep the beverages (coffee, tea, milk etc) warm whole day, making it a great gift for lover, dad, mom, wife, husband, grandparents and all your loved ones on Valentine's day, Thanksgiving and Christmas.