... with TaxCalculation.1, The device could be detected automatically by PC without the driver, and plug&play.2, ... changing the battery for a long time.3, The device applies to account by normal operations, such as" +,- ... the mode of calculator (CAL).6,This device will automatic turn off during 6 minutes of ... *9.5*3.0cmcalculator Compatibility This device compatible WINDOWS ME,2000,XP,VISTA and MAC OS