USB SILICONE CUP COASTER HEATERProduct SpecificationsMaterial: Silicone + Carbon FiberSize: 9x0.6cmPower: 3.75WVoltage: DC 5VCurrent: 750MAConnect the USB cable to the computer or a 5V charger's switch interface, and the coasters will start generating heat.The silica glass needs heat insulation on the cup; then it can play an insulation role (please do not use recessed bottom cups; glass cups are best).Please do not use this insulation coaster for outdoor functions.To extend the product's lifespan, please unplug the USB cable when not in use.It is only used to keep your tea or coffee warm but cannot be used for heating.Package includes:1 USB cup warmer
