... mouse pad calculator with USB HUB* 4 USB HUBS ( 1 in ,4 New smartdesign !! Multifunctional mouse pad calculator with USB HUB Model No.BJL- ... office ,school and home, etc.* Multifunctional mouse pad calculator with USB HUB ,* 12-Digital arithmetic ,ultrathin touch screen button* Power ... : PVC housing material* 4 USB HUBS (one in ,three out ) Version 2.0* Color: black ,whitePackage Detail* Product Size ...