USB cartoon thermos coasters 

 This product is non-toxic and odorless silica gel thermal coasters, through SGS international certification, can be very good heat to the bottom of the cup

[specifications and parameters]

 Product size: diameter: 9.5cm* thickness: 0.5cm

 Material: rubber + carbon fiber + electronic components

 Packing: material blister plate + color box

 Product power: 3.75w

 Product current: 750MA

  [instructions for use]

 1. Connect the USB cable to the computer or the 5V charging adapter, and the coasters will start to issue

 Hot.

 2. Put the cup that needs to be kept warm on the coasters to keep it warm. (please do

 Use a glass that is not dented at the bottom. Glass is better.

 3. Please do not use for any purpose other than the function of this insulating coasters.

 4. This thermos coasters are only used for heat preservation, not heating.

 5. Unplug the USB cable when not in use to extend the life of the product.