1. Time synchronization method: RJ45, communication protocol Transmission Control Protocol/Internet Protocol, WIFI 2. Clock accuracy: Operating time accuracy: 20ms 3. Power supply method: AC220V 4. Timekeeping method: Temperature-compensated crystal oscillator timekeeping, RTC annual error less than 1 minute without time source; 5. Display method: Dot matrix clock and text information 6. Management method: Equipped with text display function, executes text display tasks based on the start and end times, content, and frequency of text information display; 7. Display color: Red 8. Frame material: Stainless steel frame, acrylic panel 9. Installation method: Wall-mounted 10. Application: Classrooms, hospital offices, stadiums, etc.