Thunderbolt 3 PCIe expansion chassis for Thunderbolt 3/4 laptops/desktops; Dual external PCIe 3.0 x16 slots (each slot supports up to 2700MBps/21.6Gbps) Enclosure for video capture / Fiber / Ethernet / Firewire that are singlewidth up to 8in long; 3.3ft (1m) Thunderbolt 3 cable included Add a 2nd display via DP 1.4 and TB3 ports; Supports 8K/4K Chassis delivers 25W per card; Dual internal 12V (15W) SATA power ports PCI Express box is daisy chain compatible; Driverless; macOS/Windows/Linux