Features: 1. With a checkback function, total button, clear input function. 2. Applicable to gift occasions: opening ceremony, awards commemoration, business gifts, advertising promotions, anniversary celebrations, public relations planning, trade fairs, festivals, employee benefits. 3. Dual power supply: solar power, electronic dual power supply, lasting for a long time, always with power. 4. Practical equation calculation - Commonly used logarithms for Calculating offices, finances, etc. 5. Broad compatibility - suitable for office, finance, etc.Specifications:Model: CT-840LMaterial: ABSPower Supply: Dual Power Supply, Solar Energy+AA Batter(Not Included)Display digit: 14Package List:1 * Calculator(No Battery)1 * User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia