Brand and Model: Casio DJ-120D Plus (12 Digits). Screen: Very wide and clear screen that accommodates 12 digits. Two-Way Power System: Works on solar power in light, and automatically switches to the backup battery in low light to save calculations. 150 Steps Check Feature: Allows you to review and correct the last 150 calculation steps you made using the automatic arrow keys (▲ and ▼) or the AUTO REVIEW button. CORRECT Button: Allows you to modify any number you made a mistake entering during review without needing to restart the calculation from the beginning. Multiple Zero Buttons: Contains independent buttons for (00) and (000) to speed up the entry of large amounts and millions. Profit Margin Calculation (MU - Mark-up): A dedicated button to facilitate the calculation of cost, selling price, and commercial profit margins. Decimal Control Keys: Slider keys to set the number of digits after the decimal point (4, 3, 2, 1, 0) and the rounding system (F, CUT, UP, 5/4). Grand Total (GT): To save and display the total sum of several separate calculations. Design: Very durable, comfortable plastic buttons resistant to intensive use, and stabilizing bases that prevent slipping on the desk.