Such machinery have adopted the most advanced computer-control system and the servo motor directly-driven technology and feature low noise and low vibration. They have got rid of the conventional mechanical stopping mechanism and can realize the quick starting and stopping. Their speed can reach 2500spm at the maximum, improving working efficiency. 33 sewing patterns can tackle with sewing of buttons of different specifications easily. The strengthening function at the completion of the sewing can prevent the thread-loose. Such machinery function in the pattern editing and combining. In case of emergencies, like the needle breakage, they can stop to prevent the damage of materials. The application scope of the working voltage of the computer-control system is large and the humanized side handwheel adjustment function can make the regulation and maintenance more convenient. Five kinds of accessories are available to meet different demands of users.