An accountant-recommended calculator with 2-line alphanumeric display Combines the editing capability of spreadsheets with the simplicity of calculators. Allows you to easily track back up to 1,000 entries for verification and corrections. Performs Buy/Sell analysis with 3 simple keys to minimize the need to recalculate. Dual power. Runs on solar power and 1 rechargeable lithium battery (battery is included).