The Radial USB‑Pro is a plug‑and‑play stereo USB direct box that takes digital audio from any Mac or Windows computer and converts it into clean, balanced XLR outputs for connection to a PA, mixer, interface, or powered speakers. It uses high‑quality 24‑bit converters (up to 96 kHz) and is powered entirely over USB, so no drivers or external supplies are needed. A front‑panel level control and a built‑in headphone output let you monitor and adjust audio quickly, while a mono‑sum switch and optional transformer isolation help deal with phase issues and eliminate hum or buzz from ground loops. With its rugged 14‑gauge steel housing and simple operation, the USB‑Pro is a reliable way to feed laptops into professional sound systems for backing tracks, presentations, DJ playback, or studio transfers.