Work without external power, energy saving.
工作时不需外界动力，节省能源。
On a full charge, the Model 7500 can operate from four to six hours without external power.
若充饱了电，「模组7500」可以在没有外接电源的情况下，连续使用约四至六个小时。
The invention adopts the impeller fluid self-drive method, the fluid drives the impeller to ensure that the boundary layer brushes rotate without external power;
本发明采用叶轮流体自驱动方式，由流体带动叶轮使边界层刷转动，无需外部动力；
The invention adopts the impeller fluid self-drive method, the fluid drives the impeller to ensure that the boundary layer brushes rotate without external power;
本发明采用叶轮流体自驱动方式，由流体带动叶轮使边界层刷转动，无需外部动力；
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