Here are the Garrett AT PRO and Teknetics Patriot detectors. The first machine was released in 2010, the second one launched in 2017. Have they changed over the last 7 years? See the comparison between the Garrett AT PRO and Teknetics Patriot: a review, depth and recovery speed tests.
All info on the Garrett AT PRO metal detector is collected here (news, tests, comparisons) and on Knowledgebase pages (specs, features, repair, user manual, the list of coils). All about the new Teknetics Patriot is here and here.