Terms like complement, enhance, and augment are often used in such a context. A common sense of to complement is "To complete, to bring to perfection, to make whole. [eg] We believe your addition will complement the team." Wiktionary also shows a sense close to what you seek: "To provide what the partner lacks and lack what the partner provides. [eg] I believe our talents really complement each other."
Edit: Indicating that your device works with a broad range of equipment is likely to require additional terms that specify what kind of equipment your device connects to (or, as coleopterist phrased it, plugs into or integrates with. For example, "This video printer complements / enhances / integrates with / is compatible with / connects to / plugs into / works with / attaches to / augments any ultrasound machine that supports XVGA output."