Nice appearance - 12 digits display,large numbers are easy to read.Big and sensitive keys for simple calculations,perfect for office,primary school, market or home use. Dual Power Calculator - Solar power(works only when it is bright) and battery power (1 AA battery). Multi - Function Calculator - Tax , Function and Command Signs.On and Off buttons, Profit margin %, +,-, Key Rollover Specification - ABS material, size 5.7 x 4.7 x1.8 In, weight 3.8 Oz (Each piece). Doesn't take up much desk space, but it's big enough to be comfortable using it. Note: Some buyer may use it in the early morning or night. The screen maybe difficult to read in low light,please insert one AA battery for continuous and accurate usage.If you have any question about our product, feel free to contact us,and we will reply within 24 hours.