. 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/10GbE connectivity combined with Qtier auto-tiering storage and installing a 10GbE/5GbE/2.5GbE network expansion card. In addition TS-251D can be used with QNAP’s smart AI photo management application QuMagie 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..