With its PCIe slot, users can easily expand the functionality of the TS-251B. A QNAP QM2 card can be installed to add M.2 SSD caching and 10GbE connectivity; a compatible wireless adapter (e.g. QNAP QWA-AC2600) to create a wireless storage and streaming environment; a USB 3.1 Gen 2 (10Gbps) card to increase the number of USB ports; or a QNAP QXG-10G1T 10GbE network expansion card to add 10GbE connectivity.