Bamboo Office Calculator 12 Digits LCD Display School Special Gift Christmas Counting Commercial Tool Battery Solar Powered Features: 1. The calculator has a 12-digit design, and results are not rounded. 2. For operations exceeding 12 digits, error handling occurs; reset by pressing ON/AC only. 3. For incorrect input, press the backspace key to delete digit by digit. 4. The calculator automatically shuts off after 12 minutes of inactivity and enters sleep mode; press ON/AC to wake it up. 5. When the operation result exceeds 12 negative digits, the minus sign will not be displayed. 6. Avoid using it in strong light. Specifications: Power: SOLAR Dimensions: Approx. 170*82*19mm (6.69x3.22x0.75 inches) Power Supply: Solar power, no need to replace the battery How to Use? Wipe the LCD screen and solar panels with a soft dry cloth, store in a dry and cool place when not in use. It is forbidden to place the product in water or direct sunlight. Package includes: 1x Bamboo Electronic Calculator