| Screen Size & Resolution | Size and clarity of display for user input and info visibility | 5 | Large, high-res screens improve readability and ease of use | Reduces errors and speeds up transactions | 7-inch screen with 1024x600 pixels or higher |
| Touch Responsiveness | Sensitivity and accuracy of touch controls | 5 | Smooth, lag-free touch enhances user interaction satisfaction | Reduces delays and frustration during payment | Response time < 50ms, multi-touch support |
| Physical Button Availability | Presence of tactile buttons for accessibility and backup | 3 | Provides alternative control method when touch is impractical | Improves usability for all customer demographics | At least 3 programmable buttons |
| Interface Customizability | Ability to adapt UI based on user needs or business branding | 4 | Custom layouts and themes improve operator efficiency | Creates familiar and appealing environments for customers | Support for custom button colors, fonts, and screen layouts |
| Speed of Transaction Processing | Time taken for terminal to complete payments | 5 | UI feedback should clearly indicate process status | Fast payments increase satisfaction and reduce queues | Average transaction time < 4 seconds |
| Multi-language Support | Ability to display UI in multiple languages | 4 | Dynamic language switching improves usability for diverse users | Broadens customer base and reduces confusion | Supports at least 5 common local languages |
| Security Features | Safeguards like encryption and secure PIN pad | 5 | Secure UI components protect sensitive input data | Builds customer trust and protects privacy | PCI PTS certification compliance |
| Audio & Visual Feedback | Beep sounds, vibration, and lights confirming inputs | 3 | Enhances user confidence during operations | Minimizes input errors and reassures customers | Adjustable volume & LED indicators present |
| Ergonomics & Physical Design | Ease of use in physical handling and positioning | 4 | Layout affects how intuitively users interact with UI | Reduces fatigue and increases comfort during use | Compact size with tilt adjustable display |