1. LED display, 90mm, visibility within 30 meters, indoor and outdoor available 2. Max. score 99:99, max. game 9:9, score and game are on same screen 3. 17 pcs buttons, each button has separate function 4. Special screen used by operator 5. Rotational screen design to protect screen surface 6. Wear-resistance, keeps brightness for long term 7. New design, fashionable, small volume and weight, easy for taking 8. Used for ball game, such as table tennis, badminton, volleyball and so on 9. Shows scores for both sides up to 99 VS 99 10. Shows periods up to 9 11. 180 degree Rotation screen 12. Simple to use 13. Lightweight and easy to carry 14. High brightness intensity 15. Large LED: Visible from 30m in open field 16. Operate method: Internal Lithium Battery 17. Battery recharge time: 6 hours 18. User friendly for table tennis and volley ball referee 19. Electric: DC 12V; Output: DC12V, 20. Working environment temperature 10°C ~ 50°C 21. Relative Humidity: ≤85% 22. Shock Resistant: IP52 23. Red Φ5mm LED use for more than 100,000 hours 24. Size: 329.0 x 230.0 x 45.0 mm 25. N.W.: 1.5 kg