The Great Wall and Dr. Peng are a family. Installation is not recommended! I've used them all, claiming to be tens of megabytes. You can return them if you're not satisfied for a week, but you'll know that the card won't open a page after using it for a week. It's fast to install telecommunication optical fiber 12m as far as possible, but it's not available in some places. You can call Telecom 10000 to ask. Unicom has not used it and will not comment.