Laptop Buddy Deluxe USB Beverage Warmer with 4 Port Hub USB Four Port Hub Easy installation, no driver required, plug & play Four USB 1.1 ports so you can power multiple USB devices; works with MAC or PC Keep beverage, coffee or tea warm at 122- 140 degrees Fahrenheit (50-60 degrees C) on/off switch controls warmer; red LED indicates when warmer is on and green LED indicates when warmer is plugged into your USB USB powered, no batteries required