Easy on the eyes & ears. Choose 12 digits for normal print size or 10 digits for big print. Huge printed characters are 150% larger than other calculators. Fast 6 lines-per-second thermal printing calculator is whisper quiet. Features include Cost / Sell / Margin, Time / Date feature, Two Independent Tax Keys, Item Count, Grand Total, & Change Sign functions. Power Source(s): AC; Display Notation: Numeric; Number of Display Digits: 10; 12; Memory: 4-Key.