There are two options to determine your Dell computer model:
Option 1: Use the Dell Service Tag Detect Tool
Browse to the Dell Support Website and use either SupportAssist to detect your product type, or the search box under Search Support. If you know your Service Tag, enter it in the box provided.
You will be taken to your computer model product page.
Option 2: Check the System BIOS
To check your computer model in the computer’s BIOS, restart your computer and tap the F2 key repeatedly at the Dell logo screen. The first page of the BIOS should show the specific computer model.