https://blog.wongcw.com/2020/11/22/viewsonic%e5%ae%a3%e5%b8%83%e6%8e%a8%e5%87%ba%e5%85%a9%e6%ac%be%e6%96%b0%e9%a1%af%e7%a4%ba%e5%99%a8vp2468a%e5%92%8cvp2768a/