The so-called Surface Duo was one of five products announced, with the others being the Surface Laptop 3, Surface Pro 7, Surface Pro X and Surface Neo.
The Surface Pro products are two-in-ones, while the Neo is a dual-screen tablet.
The Duo is scheduled to be released by the holiday season in 2020. It has two separate screens unlike other devices of the same size like the Galaxy Fold.
The Surface Neo will run a version of Windows 10 known as 10X.
The new range of Surface laptops will include a 15-inch version powered by the AMD Ryzen processor.
New earbuds, with the Surface branding were also unveiled at the launch by chief product officer Panos Panay.