Bring PCIe expansion to Thunderbolt 5 workstations with a chassis built for focused, single-card deployments. Echo Express SE I gives IT teams a compact way to add specialized adapters, storage controllers, capture cards, or other PCIe peripherals to systems that need more than native I/O. Its one-slot design keeps the footprint controlled, making it easier to place beside a workstation, in a studio rack, or on a crowded production desk. Universal 100-240 V, 50-60 Hz power support simplifies deployment across mixed environments, while Thunderbolt 5 connectivity aligns the enclosure with modern high-bandwidth host systems. For teams standardizing around a specific add-in card, this enclosure creates a clean path to extend capability without replacing the host machine. That matters when the card is the requirement, not the computer. Sonnet builds this class of expansion hardware for users who care about predictable integration, not consumer convenience features. The result is a purpose-built enclosure that helps preserve workstation investment, extend useful life, and keep specialized PCIe hardware accessible in a compact form factor.