1) Mouse pad calculator with speaker and USB Hub 2) Using as mouse pad, calculator, USB HUB, speakers 3) Black lighting Hot ... for using in office ,school and home, etc.* Multifunctional mouse pad calculator with mini speaker* 12-Digital arithmetic, ultrathin touch ... USB (for USB HUB) * Blue mood light* Memory calculation: M+,M-,MRC* Mouse Pad: Plastic housing material* 5 USB HUBS (one in ,four out ...