The simple but modern modular design conveys the people-oriented design concept and creates the magnetic connection between two modules through manual operation and sensor. Manual operation and sensor: the emergency manual button comes with inductive dim lighting, featuring night sleep patterns to avoid disturbing the users. The infrared sensor can automatically identify the flush size within one minute, which is energy saving. Motion sensor: according to their actual usage situation, the user can make the modules flush water by slightly waving one hand. Meanwhile, the additional USB interface can facilitate the charging of batteries.