Large color-coded keytops. Automatic punctuating of large numbers every three digits. Allows you to add or subtract from a running total stored in the built-in memory. Dual powered capability - Save battery and use it for longer with solar and automatic battery back-up for use anywhere, anytime. All the calculator functions you need - Supporting tax and business calculations and item counting, TX-220TS features a decimal point setter, square root, percentage and reverse function Extra large tilt display screen - With an angled, crystal display supporting 12 digits and minimising glare, numbers are easy to read. Size: 145 x 145.5 x 30mm Weight: 166g