Thank you for your reply. However, I still don't know if adapter B is an official product or not.1. According to parts-people.com, it seems to be an official product.2. Amazon's seller said that it was the official product but the firmware version is different.3. Another amazon's seller said that it was a fake official product. I had both adapter A and adapter B.Both worked well with Dell laptops. Recently I bought a new accessory but adapter B did not work with it.So I was wondering if it was the official product or not. Anyway, I decided to return it. Thank you.  
Hi, I have two Dell power adapter.  Although the seller of amazon.com replied me "we guarantee our items to be 100% offical product", I am wondering if the adapter B is the official product or not.  Q. Please let me know if the adapter B is the official product or not.  [IMAGE] [IMAGE]    [IMAGE] [IMAGE]   Thank you.     
Please let me know if the adapter B is the official product or not.