... -in - one device,It compatible PC Keypad and 12bit Commercial Calculator with TaxCalculation.1, The device could be detected automatically by ... account by normal operations, such as" +,- ,*,/, %" memory oprations, such as " M+, M-,MR,MC" ; and tax calculations by tax-set, tax-reference ... disappear on LCD. It expresses now in the mode of calculator (CAL).6,This device will automatic turn off during 6 ...