MobileSharpSlim Mousepad 3-Port USB 1.1 HUB with Calculator (Black) Slim Mousepad 3-Port USB 1.1 HUB with Calculator (Black) for you to use with your PC or laptop computers. Can be used as both Mousepad and Calculator, also with 3 Port USB 1.1 Hubs, can be connected with USB connector. 10-Digital arithmetic, Memory Calculation: M=, M-, MRC With blue moodlight . Slim, only about 7 mm in thickness .