The USB Drink Warmer and 4-port USB hub is probably the most useful USB-powered device we've come across. Not only does it provide several useful functions, but it actually makes a ton of sense for it to be USB powered. Many of us enjoy tasty beverages while working on a computer. The USB Drink Warmer will keep that drink warm! In addition to its drink warming abilities, the USB Drink Warmer also includes four USB 2.0 ports and a backlit LCD display which shows the temperature of the heating pad (in F or C) as well as the current time. Features an on/off switch as well as an alarm.