Daisy chain up to six compatible devices with the Dual-Port Thunderbolt 3 Expansion Card from QNAP. Designed for use in select QNAP devices, this expansion card installs into an available PCIe 3.0 x4 slot and provides two Thunderbolt 3 ports capable of transferring data at up to 40 Gb/s to streamline real-time 4K video editing, content sharing, collaborative workflows, and more. Devices include compatible NAS enclosures and Thunderbolt 3 10GbE adapters. A low-profile bracket is pre-installed on the expansion card and a full-size bracket included. Using an adapter allows you to connect Thunderbolt 2 devices to transfer data at up to 20 Gb/s.