https://qooah.com/2015/05/20/oppo-r7-%e5%8f%8a-r7-plus-%e6%ad%a3%e5%bc%8f%e7%99%bc%e8%a1%a8%ef%bc%8c%e5%94%ae-2499-%e4%ba%ba%e6%b0%91%e5%b9%a3%e8%b5%b7/