The service tag on the bottom of the computer will tell us a lot of things. Please turn over the laptop and get it for use. You have a great price no matter what the service tag says but your chance of selling will increase a lot by telling us that number. It will get the specifications for the inner parts, like the processor, when it was built, etc.
Actually It looks like a Dell Inspiron 1150 or similar: https://www.cnet.com/products/dell-inspiron-1150-home/specs/. See also: https://www.worthpoint.com/worthopedia/dell-inspiron-1150-celeron-mobile-1790332936