The WD My Cloud EX4 Diskless is a 4-bay NAS unit by Western Digital, designed for use with PCs. It features USB 3.0 compatibility and a 3.5-inch form factor, making it ideal for home or small office use. With a cloud storage feature and support for HDD drive types, this NAS unit provides fast write speeds and can be easily connected via Ethernet or USB-A interfaces. Made in the United States, it is part of the WD MyCloud product line, offering reliable and efficient storage solutions for all your digital files.