You get back to your desk to a flurry of urgent emails and by the time you've averted all manner of minor disasters like the superhuman workhorse that you are, your cup of steaming refreshment is stone cold.Plug it into a spare USB port on your computer and the coffee USB warmer will keep your beverage at the optimum operating temperature for as long as you care to leave it. This USB cup warmer & USB 4 port hub is ON/OFF control. Portable coffee USB warmer. Heat your beverage in any cup. Easy installation, no driver required, plug and play. And 4 port high speed USB HUB is very usful. But if you are reluctant to give up one of your USB ports for this, fear not because the warming device has four extra USB ports which you can use for your other external devices. This coffee cup warmer is ideal for the office and make great gifts. Order today!