... Calculation: M=, M-, MRC 2. 3 Port USB Hubs. 3.mood light with Mousepad Calculator Mouse pad ... with 3 Port USB Hub Functions4 USB 1.1 hubs (one in, three ... or data transmission Such as keyboard,a mouse,USB flash, MP3, MP4 etc. CalculationSet the ON ... unit lacks of power, please replace the AGl3 button cell battery with the same specifications. ContainPacking Information: ...