Meet the OWC Mercury Helios 5S, a Thunderbolt expansion chassis that turns compact Macs and PCs into pro‑grade workstations with no fuss. Plug it in and instantly add a full‑size PCIe slot so you can use ultra‑fast storage, high‑speed networking, video capture and audio cards that your laptop or small desktop otherwise cannot. With three extra Thunderbolt 5 ports for drives and displays, it expands your connection options while keeping heat and noise down. The result is more capability, smoother workflows and fewer limits on what your system can do, all from a single cable and tool‑free card installation.