The TS-251D integrates secure data storage and multimedia entertainment into one device. Featuring a PCIe slot, the TS-251D allows you to flexibly extend NAS functionality and potential applications. You can enhance overall system performance by installing a QNAP QM2 card for M. 2 SSD caching/10Gb E connectivity combined with Qtier auto-tiering storage and installing a 10Gb E/5Gb E/2. 5Gb E network expansion card. In addition, TS-251D can be used with QNAP\'s smart AI photo management application, Qu Magie, which integrates AI image recognition to group similar photos together in album \"People\", \"Things\" and \"Places\". The TS-251D features an HDMI slot to stream multimedia throughout your home. The TS-251D supports dual-channel hardware decoding and transcoding, allowing you to view NAS media files smoothly across various devices.