The Sonnettech Echo III Desktop is a Thunderbolt 3 to PCIe card expansion system that allows connection of up to three full-length PCIe cards to computers with Thunderbolt 3 or 4 ports. It features three PCIe 3.0 slots, an integrated 400W power supply, and supports a wide range of Thunderbolt-compatible, non-GPU PCIe cards. The system is designed for creative professionals who need to add video and audio inputs, transcoding, storage, and network connectivity to their setup