Vktech Blue Mood Light Ultra-thin Usb Powered Mouse Pad Mat / Calculator / 4 Usb Hubs All in One PC Computer Laptop Black 3 in 1 with mouse pad, calculator and 4 ports USB hubs With blue moodlight / built-in LED light indicator On/off setting for caculator, caculator can be operated without USB power Support both full-speed (12Mbps) and low-speed (1.5Mbps),USB2.0 Support Windows 98/2000/ME/XP/2003/vista and Mac OS 8.5 or over version