Size: 17.5 * 10.8 * 1.5cm Material: Plastic Color: green / red / green Specifications: 12-bit calculator 1: Super screen and font to clearly observe the calculation results 2: High-penetrating acrylic plate protection display panel, protect the screen, not easy to draw 3: Battery + solar dual power drive, long-lasting, long working hours 4: 8 minutes without using it automatically, extend the machine life, save energy 5: One million button life, use plastic buttons, comfortable, hard to wear 6: With 120 steps and correction functions, automatically correct computing errors and update results