This USB can cooler/heater is actually a Pettier thermoelectric device that will keep your drink at the desired temperature for hours . It can heat your food up to 40 degree Celsius and chill a can of cola down to 15 degree Celsius.

With this latest  gizmos you won't have to move away from your workstation to  fetch drinks from the fridge or to warm food in the microwave.

 It doesn't use up any extra electricity.With a flip or a switch you can decide whether you want your can to stay cold of steaming hot.