The SanDisk iXpand for iPad or iPhone is a standard USB flash drive that also features a Lightning connector. It's designed to let you connect to your iPhone or iPad and transfer out photos, videos, and music. File selection is done via an included (free-download) iXpand app. The files get transferred to the drive, and from there you can offload them to a computer the way you normally would from a USB flash drive. But this is only one of the features of the iXpand. You can also just keep the files on the drive and access them at any time from your iPhone/iPad. To do this, just connect back into the iPhone/iPad, and the iXpand app will recognize the files and will allow you to access them right off of the drive. The iXpand also provides a convenient way of simply freeing up your iPhone/iPad—especially in urgent situations, and it can be used as a standard USB flash drive. It supports virtually all the popular photo, video, and audio formats. This model is compatible with iOS 7.1+ and Macs and PCs.