Features: 

• Powered by any devices with output 5V USB port, such as your computer, desktop, laptop, tablet, mobile power, and so on, easy and convenient.
• Perfect for keeping your beverages warm, such as coffee, tea, milk tea, water, etc.
• USB Design, just place the teacup or coffee cup that needs to be heated on the coaster and then charge it directly to the temperature you want with the USB port.
• Great for use at home and office, keeping you brew warm on cold days.

What in the box:

1 x Silicone USB Charging Heating Coaster