One of the major reservations I have with USB warmer is the fact that they continue to be bound to the computer, and so sometimes we get from the desk without thinking about the removal of the connection, thus determining that the peripheral and perhaps even against the USB connector into the process through the power generated.
Not so with this pair from Thanko USB Cordless Warm Slippers, it hooks via USB to warm up, and when it is fully charged, unplug it and simply walk through the home office Piglets without your all frozen and chills. The internal lithium battery is good for a fair amount of time before a trip to the USB port. It comes with a light indicator to let you know when is the next trip is for a performance of mine, and there is an option to maintain the temperature between low and high levels. Inside the slippers, you will find an ultra-thin aluminum heater used. If you are not near a USB port, you can always connect it via a socket.