QNAP TS-421 4-bay Personal Cloud NAS, DLNA, Mobile App, iSCSI Supported Organize your data/content and backups in one centralized location. Synchronize files across computers, tablets, and mobile devices, and share files across different groups and communities. Collect, enjoy, and share your large photo, music, and video collection. Enjoy HD movies or family videos on TV when streamed through various network players. Access, manage and enjoy all your files with your tablets and smartphones. Extend your diverse applications on the TS-421 by installing more than 80 apps on demand in the App Center.