After-sale commitments :
1、the purpose of after-sale :
   Perfect quality assurance services in order to fine quality conquest users.
2、the purpose of after-sale :
   User-friendly, service users, in the minds of users to establish an "YONGDA" image.
3、the after-sale work objectives :
   Aftercare zero complaints, and finally to the user satisfaction rate.
4、the standard after-sale :
   To users of the "three-services", that is, all-weather services;- Home services, free installation, all filed return;All free voluntary service (warranty period), a product quality and quality of the free installation service. Without Gouji trail by warranty period, the implementation of standards.


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