The SeaGate Backup Plus Portable Storage 4TB is an external hard drive designed by Seagate in a 2.5-inch form factor. It offers a storage capacity of 4TB, with interface options for USB 3.0 and USB 2.0 connectivity. This portable HDD is powered by USB and is part of the Backup Plus product line, making it a reliable and convenient option for data storage and backup. With its sleek design and high storage capacity, this Seagate external hard drive is a great choice for expanding storage on the go.