... USB 1.1 hubs (one in, three out)(Type A:without USB hubs,Type B:Versionl 1.1, ... operate the hardware or data transmission Such as keyboard,a mouse,USB flash, MP3, MP4 etc. CalculationSet ... arithmetic. Press `M+`, `M-` & `MRC`to carry out memory calculation. Press `AC` to end the operation,resetting to ... off the calculator The unit is used as a mousepad. Battery replacementWhen the display is blurry,it ...