Post Type Field for Contact Form 7 adds three new field types to Contact Form 7: a drop-down menu, a group of checkboxes, and a group of radio buttons. Each one is automatically filled with the titles of posts from any post type you choose (posts, pages, products, or any custom post type registered on your site).
This is useful when you want visitors to pick from a list that already exists in your content, such as choosing a location, category page, product, or any other custom post type entry, without maintaining that list by hand inside the form.
orderby and order) of the listed posts.id: and class: tag options, the same way native Contact Form 7 fields do.