This is a SHARP scientific calculator (EL-509M-WX). Includes instruction manual, operation confirmed. I am selling it because I no longer have the opportunity to use it. Please refer to photos 7 and 8 for the functions. There is some dirt on the cover (see photo 9). Disinfected with ethanol. - Brand: SHARP - Model: EL-509M-WX - Color: Black - Accessories: With cover *Please purchase only if you understand that this is stored by a private individual. *The box in photos 7 and 8 will not be shipped.