■ About the Product This is a CASIO fx-31 scientific calculator, released in 1978 (Showa 53). It features a Vacuum Fluorescent Display (VFD), which was cutting-edge technology at the time. Its most distinctive feature is the vibrant blue-green numbers that appear to float due to self-illumination. This unit offers a charming retro Showa and mechanical atmosphere, different from current LCD screens. It would be a great find for collectors or fans of vintage gadgets. ■ Product Condition Operation: Power confirmed. (Confirmed that the calculation functions, button responses, and slide switch operation are possible using batteries.) Exterior: There are minor scuffs and dirt due to age, but the condition is relatively good considering its age. Battery Compartment: No signs of battery leakage, and the contacts are clean. Display: No damage to the fluorescent tubes; the display is bright and clear. ■ Main Specifications Display: 8-digit Vacuum Fluorescent Display Functions: 27 types of function calculations (trigonometric functions, logarithms, statistical calculations, etc.) Power Source: 2 AA batteries (or AC adapter *not included with this product*) Size: Approx. 16cm (height) x 8.5cm (width) ■ Accessories Main unit, storage pouch (*Batteries are not included, please provide your own*) 【Notes】 This is a vintage item, nearly 50 years old. While it is currently operational, future operation cannot be guaranteed. Please understand that this is an old electronic device before purchasing.