1. Pixel Pitch：P2.5mm 2. Product size：L650*H12070mm 3. LED screen pixels：256 * 768 pixels 4. Display size:640*1920mm 5. Driving mode： 1/32th scan 6. Pixels per square meter：160000dots/m2 7. the brightness is ≥ 680CD/m2 8. contrast： 6000:1 9. the best visual distance：2.5-50m 10. Frame changing speed ≥60 (frames)/sec 11. Refresh frequency ≥3840HZ 12. Smoothness ≤0.5mm between any adjacent pixels; The splicing gap of unit board is less than ＜0.5mm. 13. voltage is: AC110V-224V／50HZ 14. The ambient temperature is-20℃ ~+60℃ 15. The ambient humidity is 10% ~ 90% 16. The blind spot rate is 2/10000 < (no abnormal bright spots). 17. The equipment works continuously for more than 72 hours (unlimited). 18. The average life of LED is more than 100,000 hours. 19. The total power consumption is 800W/㎡ viewing angle (horizontal/vertical). The horizontal viewing angle is ≥ 170°, and the vertical viewing angle is ≥ 160°. Gray scale: 100% brightness, 16-bit gray scale, and 20% brightness, 12-bit gray scale. Within the color uniformity of 0.003 cxcy, it has a single-point chromaticity correction function to display the color of 16.7M color 20. Color processing is 281.4 trillion. 21. module brightness uniformity ≥ 98%