The Western Digital 1.5 TB Elements hard drive (WDBAAU0015HBK) is a plug-and-play device that is ready to use right out of the box. With the USB 2.0 technology, users can move files and media to the external hard drive at fast speeds. The Western Digital 1.5 TB Elements hard drive offers compatibility for both PCs and Macs so no matter what type of system users have, they will be able to move and store files easily. The WD hard drive uses power saving technology, and therefore does not need to be plugged into an outlet to work. The WD hard drive requires no external power supply, and will work by simply connecting the USB cord to the computer. With 1.5 TB of storage space, users will find that they have ample room to back up and store all of their files on this external hard drive. The Western Digital 1.5 TB Elements hard drive measures 11.65 by 17.80 by 3.6 centimetres, respectively, and weighs just 1 kg, so it does not require a lot of room.