... - one device,It compatible PC Keypad and 12bit Commercial Calculator with TaxCalculation.1, The device could be detected automatically by PC ... , The device applies to account by normal operations, such as" +,- ,*,/, %" memory oprations, such as " M+, M-,MR,MC" ; and tax calculations ... choose the mode for operation . a.Connecting this device by USB cable to PC, it would show ''PC-KEYPAD'',it expresses ...