... Mouse pad calculator with speaker and USB Hub 2) Using as mouse pad, calculator, USB HUB, speakers 3) Black lighting Hot sale ... ,fashion and slim* Using as mouse pad, calculator,USB HUB, speakers * 5 USB HUBS (one in ,four out )* Blue backlightingMain Specification ... touch screen button* Power Source: 1xAG10(for calculator) / USB (for USB HUB) * Blue mood light* Memory calculation: M+,M-,MRC* ...