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Sonnet designed the Echo Express III-D and III-R Thunderbolt to PCIe card expansion systems to be easily moved from Thunderbolt 3 to Thunderbolt 2, and vise versa. Simply swap the existing Thunderbolt interface board with the replacement board, and then your chassis will instantly operate with the new interface. With the Thunderbolt 2 interface card you get:
Product shown without included bracket