I'm Cassie from Guangzhou Shinestage.Welcome to our video. Next I'll take you into Yona Technology, from the founder of the company to the history of development, to building a showroom to introduce our products, and our manufacturing center. We are an integrated company of industry and trade, and all of our products are certified by TUV, SGS, and EU CE. All products are tested by flaw penetration test and QC test before packing.