LareinaXXX Solar Energy Calculator Practical Card Type Transparent Mini Portable Cartoon Calculator（2pack）

I stumbled across these calculators when shopping for school supplies, and I decided to buy them. No regrets. First off, these calculators are solar powered which means the person doesn't need to replace batteries every time it runs out, you just have to place it in a sunny area: maybe near a window. The calculations are correct, but there are no parentheses which are kinda inconvenient.