Desktop, 1-slot Thunderbolt 3 to PCIe Card Expansion System for up to full-height, half-length+, double-width PCIe card. Features temperature-controlled fan, and two Thunderbolt 3 ports. Second Thunderbolt 3 port supports daisy chaining of up to five additional Thunderbolt peripheral devices, a single USB 3 Gen 1 (5Gb) or Gen 2 (10Gb) peripheral device, or one 5K or two 4K displays.