Stop in for a cup of coffee

So a question out to the collective coffee brain trust. After getting the opportunity to visit Gettysburg Battlefield (thanks again @ZMan67S ) my interest in what we speculate as a civil war defensive wall is renewed. As a result I want to purchase a metal detector and cruise the wall this winter. I know less about metal detectors than I know about Women. Any y’all ever used one? What are the features you need vs the ones ya don’t. I don’t live on the ocean so no need for submerge or salt water resistance. Any guidance would be much appreciated!
https://www.minelab.com/usa/metal-detectors/equinox-800
John this is the one we have. I did a lot of research before we bought it several years ago. Like anything new and exciting, we used it several times after we got it, and pretty cool to find items on the property.