| 3 key memory |
| 8 digit display |
| 8 digit large angled LCD display |
| Battery free - solar power only |
| Completely solar powered for prolonged use |
| Delivered in 90% recycled packaging |
| Delivered using zero air miles for environmental protection |
| Four key memory |
| Large equals bar |
| Large equals bar for easy entry |
| Large keys and display for easier use |
| Made entirely from recycled plastic |
| Made from 50%+ recycled plastic |
| Percent key |
| Soft rubber keys |
| Soft touch rubber keys for long lasting use |
| Square root |