3-inch hour-minute-second synchronous clock for primary and secondary schools

1. Communication method: Wired network or WiFi; 2. Time synchronization method: NTP, colon displays synchronization status; 3. Display content: Hours, minutes, seconds; 4. Display color: Red, customizable upon request; 5. Timekeeping method: Temperature-compensated timekeeping, error 0.5 seconds/day; 6. Power supply method: External power supply, voltage DC5V; 7. Frame material: Frame made of black PC material; 8. Panel material: Frosted acrylic; 9. Installation method: Wall-mounted; 10. Clock dimensions: 460*125*23mm;