1.H7900系列都安装了最适合平缝操作的直接驱动系统，振动、噪音低于目前任何一款平缝机。Direct-drive system best for lockstitch sewing, vibration and noise are lower than any item of sewing machine nowadays. 2.与普通电机相比，本机操作系统省电60%左右，同比变频伺服马达省电30%以上。High power-saving: Save about 60% of energy compared with the common motors, 30% up with frequency servo motor.3.采用密封油箱，持续为旋梭提供干净的机油；也可使用无油旋梭，不再需要为旋梭提供润滑。Sealed oil box provides the hook with clean oil continuously; dry hook, that needn抰 lubricate, can be available.4.压脚调节螺栓上刻有刻度，数字化调节更易控制压脚压力，因此，压脚压力可轻松而准确的重设。Presser foot adjustment screw graved with graduation makes digital pressure control easy and precise.5.机器运行平稳，缝迹美观。The model runs smoothly, the stitch is beautiful.
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