A calculator talks the pressed key,the input expression and the result of calculation . According the help doc,you could update it to talk in your own voice.Talk automatically or by pressing the buttons.It support the following operators and function: (,),+,-,/,*,^,sin,cos,tan,arcsin,arccos,arctan,ln,log.Record your historical calculation in the log dialog.
) "My Talking Calculator - Click to enlarge screenshot")