The Blue Solar-Powered Dopamine Calculator by DEXIN is a large-sized desktop calculator designed for basic and financial calculations. With a large display and key size, this calculator is perfect for office and business use. 

It is powered by the sun, making it environmentally friendly and energy-efficient. The sleek design and Brand name of DEXIN ensure a reliable and high-quality product for all your office needs. 

You also have the option to put a small AAA battery in it, if you prefer not to charge it with the sun. Please note that the device requires proper sunlight for it to have more power.