只有专业人员才能安装或维修手机。自行安装或维修手机可能性带来很大的危险，而且违反保修规定。
Phone can be only installed and maintained by professionals. self install and maintain may cause danger, and against guarantee regulations.
保修：在本部分规定的特别保修。
第7条中的规定是对WIRTGEN CHINA就所交付货物的保修承诺义务的最终且唯一的规定。
The provisions laid down in Clause 7 are the final and exclusive provisions that govern WIRTGEN CHINA's warranty obligations for delivered goods.
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