*Full function mousepad usb hubs *12 digital calculator *Mini speaker,FM radio optional *4 port ... Hot selling promotinal gift mousepad usb hubs with speaker, calculator Function:5 USB HUBS (one in, four out ... ON" position, press 'C/CE' to start the calculator, pressing the function key to fulfill the 12-digital ... switch to "OFF" position to turn off the calculator. The unit is used as a mousepad. Battery ...