With USB, even if it can make it warmer, is it possible to make it cooler? It is possible! "USB Bottle & Cup Cooler & Warmer" is an epoch-making product that can do both by just turning a switch with USB connection to a computer.
Is it really possible to make and keep it both cool and warm on the voltage of USB? That is because Peltier device is used for the cooking/heating system. Thanks to Peltier device incorporated in the body, cooling and heating system could be realized in lower voltage by switching electrodes, which makes the body smaller than any of others.
Changing between warmer and cooker is one touch by just turning the switch. Also turning off the power of USB bottle cooler and warmer, without disconnecting USB with a computer, is possible.
Even with there is no additional AC power supply available in your office or home, it can make and keep your drink cool or warm powered by USB from a computer. You can enjoy drinks as you like anytime!