Here we have an old LED calculator.

Toshiba BC-815.

Shows signs of it's long life. Someone glued the name tag on and leaked some glue.

Batteries had corrosion in past, but it is cleaned up and STILL WORKS !

If you have a cosmetically good one of these, great chance to get working innards for cheap.

Requires 4x AA batteries. (NOT INCLUDED)

Very vintage.