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Subject : 
EA1442 / EA1440 & EA1441之间的区别
 
Description : 
EA1442（簧片门传感器）和EA1440（光电门传感器）/EA1441（感应式）有什么区别？
 
Solution : 
EA1442使用磁铁监控外壳门的打开/关闭。
EA1440使用光反射来监控外壳门的打开/关闭。
EA1441使用磁场变化来监控外壳门的打开/关闭。
 
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