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Subject : 
EA1440 vs EA1441
 
Description : 
EA1440（光电门传感器）和EA1441（感应式）有什么区别？
 
Solution : 
EA1440使用光反射来监控门打开/关闭。
EA1441使用改变门的磁场来监控打开/关闭。
 
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