★★Please be sure to check the text below★★ ○ Operation confirmed ○ No instruction manual - Brand: CASIO - Model: fx-375ES - Features: Dual power (battery & solar) - Condition: With cover Purchased about 6-7 years ago and only used a few times then. I have never replaced the battery, but it currently works. I have not changed any initial settings. Returns are not accepted. Please purchase only if you understand that this is stored by a private individual. Please refrain from purchasing if you are concerned or if you are particular about details. Will be wrapped in bubble wrap for shipping.