Wireless HDMI extender is a transmitter-receiver kit that sends high-definition audio and video signals from a source (e.g., laptop, cable box) to a display (e.g., TV, projector) without cables, typically operating over a 5 GHz band. They support 1080p to 4K resolutions, often over long distances (up to 820ft/250m), and are ideal for meeting rooms or home theaters.