1. System setting function; 2. Mode conversion function; 3. Near field, far field, total gain, dynamic range adjustable function; 4. Frequency conversion function; 5. Frame-related functions; 6. Image post-processing function; 7. Image edge enhancement function; 8. Color function; 9. Brightness adjustment function; 10. Depth adjustment function; 11. Image freeze/thaw function; 12. Image rotation function; 13. Body mark function; 14. Distance, perimeter, area, volume, heart rate, cycle measurement functions; 15. Measuring function of backfat thickness, eye muscle thickness and lean meat percentage; 16. Automatic backfat measurement function; 17. Fast backfat measurement function; 18. Abundant obstetric software package, including dozens of obstetric tables for 8 kinds of animals, can automatically calculate gestational age and expected date of delivery; 19. Conventional heart measurement function; 20. Image U disk/TF card storage and browsing functions; 21. Single-point and multi-point combination focus function; 22. Energy-saving protection function; 23. Text annotation function; 24. Image movie playback function; 25. System conversion function; 26. TV/VGA output function; 27. Grid setting function.