The ProOne 600 HP All-In-One (AIO) is a desktop computer with a 21.5-inch screen size, featuring an Intel Core i3-4130 CPU running at 3.40 GHz. It comes with 4GB of RAM and a 250GB SSD for fast and efficient storage. This AIO also includes Windows 10 as its operating system, making it user-friendly and suitable for various tasks. With a sleek design the HP ProOne 600 is a great choice for anyone looking for a compact and efficient desktop computer.