Eleven CT555N is a compact desktop calculator in a black casing, powered by a solar cell. Designed for everyday office and home use, it performs basic arithmetic operations and offers a simple layout that saves desk space and speeds up routine calculations. Its lightweight, durable housing makes it suitable for invoices, budgets, school tasks and general number work where a straightforward, battery-free calculator is preferred.
Advantages
The solar-powered design eliminates the need for frequent battery replacement, providing long-term, maintenance-free operation in well-lit environments. The compact footprint and straightforward keypad enable quick entry and clear results for basic arithmetic, while the durable black casing offers a neutral appearance that fits typical office and home settings.
Suitable for
- Everyday office calculations such as totals and simple accounting
- Home budget planning and expense tracking
- School assignments and basic math practice
- Point-of-sale or checkout tasks requiring simple arithmetic
Key specifications
- Power source: solar cell (no batteries required under sufficient light)
- Form factor: compact desktop calculator
- Color: black casing
- Function set: basic arithmetic operations (addition, subtraction, multiplication, division)
- Input: physical keypad for numeric entry and operation keys
How to use
Place the calculator on a flat, well-lit surface so the solar cell receives adequate light. Enter numbers and arithmetic operators using the keypad; results appear immediately on the display. For consistent performance, avoid obstructing the solar cell and keep the display and keys free of dust. The device is ready for immediate use without the need to install batteries when ambient light is sufficient.
Usage recommendations
For reliable operation, use the calculator in areas with good natural or artificial lighting. Store the unit in a dry environment and keep the solar cell exposed to light during use. If prolonged use in low-light conditions is necessary, consider occasional use of external light sources to maintain consistent performance.
