iDiskk is a USB drive with 2 connectors:1, USB3.0 A, to connect to Mac or PC. In this way, iDiskk acts as a general USB drive. Users can manager files in it, copy, cut, past or delete, ect. Users can also browse files in it directly, including preview documents, playback music and movies.2, Apple lightning connector, to connect to iOS device with lightning connector. With this app, iDiskk Pro, users can manager files in it, copy, cut, past or delete, ect. Users can also browse files in it directly, including preview documents such as .txt, .doc, .pdf, playback music and movies.(More information could be found on the website http://www.idiskk.com)iDiskk Pro is the App of the iDiskk drive, it supports the following features:* Browse files in the iDiskk.* Browse files in the app.* Transfer files between the iDiskk and the app.* Backup photo in the iOS device to iDiskk.* Backup and restore the contacts in the iOS device.* Independent music and movie playback.