The JF‑B582VL electronic computing machine provides basic arithmetic functions, including addition, subtraction, decimal and percentage calculations, and displays results on an 8‑digit LCD. It can be powered by built‑in solar cells and an internal battery, automatically switching to battery when ambient light drops.
The device powers off automatically after roughly 12 minutes of inactivity. Keys are labeled for power on/off, clear, decimal point, and various arithmetic operations. Errors such as overflow are shown as "ERROR", and negative results are indicated with a leading minus sign. This manual is written in Chinese.
| Display digits | 8 digits |
|---|---|
| Power sources | Solar panel with backup battery |
| Auto power‑off time | ≈12 minutes of inactivity |
| Supported calculations | Decimal and percentage calculations |
| Error indication | "ERROR" message for overflow |
| Negative result display | Minus sign "-" |
It powers down after about 12 minutes of no use.
The screen displays the word “ERROR”.
A minus sign (‑) appears before the number.
The internal battery supplies power automatically.