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                       Q5. Why  we use metal shell? | 
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                       We use metal shell to prevent our system  from being interfered by outside interference from other signal, background | 
                      
                     
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                       noise and magnetic field. It gives you a stable and reliable performance. Of course,  metal shell can also make our  | 
                      
                     
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                       product look nice, touch good. | 
                      
                                      
                                      
                                   
                
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