Thank you for viewing. Power Source: Solar-powered, Battery-powered Number of Batteries: 1 CR2 battery (included) Model Name: W Tax Rate Calculator, Tax Calculation Equipped with the "W Tax Rate" function, which allows for calculation of two tax rates. [Tax Calculation] Calculates tax-inclusive, tax-exclusive, and tax amount for consumption tax. The set tax rate can be changed. [Digits] 10 [Size (Depth x Width x Height) mm] 179 x 126 x 30.9 [Weight (g)] 165 [T・W・P (Combined use of solar battery and auxiliary battery)] Unlike conventional solar-powered calculators, the built-in battery protects the calculation contents even if light is blocked during calculation. [Fast Input Function] You can start pressing the next key while still releasing the previous key during input. I bought it to use for work once or twice a year, but I don't do complex calculations and instead use my smartphone or Excel, so I am selling it. It is almost unused. There is no instruction manual.