Advantages: 1. High density of integration; 2. Low power consumption, long life-expectancy and high reliability. 3. Anti-jamming; 4. Low load factor in operation; 5. Adopting the special voltage regulator invented by our company. 6. Operated through the center controller; User-friendly; 7. Memory: 200 lines; 8. Scrolling effects of the information; 48 English letters or 24 Chinese characters can be displayed at one time; 9. Mapping function between lines. 10. Information is edited through software on the computer; 11. SOS alarm system. 12. Languages of all the countries can be displayed.