12 DIGITS WITH LARGE, EASY-TO-READ DISPLAY & 3-DIGIT COMMA MARKERS; TIME, TAX & CHANGE CALCULATIONS; CURRENCY CONVERSION MODE; INDEPENDENT MEMORY & GRAND TOTAL KEY; DECIMAL SELECTOR-5/4 CUT OR FULL; PROFIT MARGIN %; CHANGE SIGN (+/-); KEY ROLLOVER; AUTO POWER OFF AFTER 6 MIN; SOLAR PLUS POWER WITH BATTERY BACKUP