The Echo 20 Thunderbolt 4 SuperDock expands a compatible computer's ports and adds storage expansion, all through a single Thunderbolt 4 cable. Three Thunderbolt 4 ports are on board -- one carrying 100W of charging power to the host -- alongside four USB-C 3.2 Gen 2 ports and four USB-A 3.2 Gen 2 ports. An HDMI 2.1 port drives an 8K at 60Hz display directly, with no adapter needed. Storage expansion comes via an M.2 NVMe SSD slot and a UHS-II SD 4.0 card reader. Networking runs over a 2.5 Gigabit RJ45 Ethernet port, and audio is handled by a 3.5mm combination audio jack, a dedicated 3.5mm microphone jack and two 3.5mm audio line-out jacks.