Dual Power: Solar energy and battery backup power keep the desktop calculator working in low light conditions (not including AA batteries)Desk Calculator Large Display: 12 digits display and large numbers , easy to use.Big Button: The electronic desktop calculator adopts a scientific large button design, which conCompatible Withms to human habits and is comCompatible Withtable to contact.Basic Calculator - Add, subtract, multiply, divide, backspace, % and MU. Auto-off when you do not use it about 10 minutesNOTE: Some user may use desk calculator in the early morning or night. The screen maybe difficult to read in low light without battery power. Please AA battery Compatible With continuous and accurate usage.colour:BlackMaterial:plasticsize:15 x 12 x 4.2cmPackage Contents:2 x CalculatorOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.Products from GuanGuan's store