This is an old CASIO fluorescent display calculator, the AL-8. It's from about 50 years ago. In addition to the four basic arithmetic operations, it also has some function features. (Time calculation, fraction calculation, etc.) Unfortunately, it doesn't turn on, but sometimes the power comes on if you shake the switch. When it's on, you can calculate, but basically, please consider it as junk. As a bonus, I'll include the AC adapter in the photo.