The Garmin Fusion® MS-BT100 is a marine-grade Bluetooth® audio adapter designed to add wireless audio streaming capability to any compatible Fusion or third-party marine head unit via an RCA auxiliary (AUX) input. Certified with an IP65 water-resistant construction, the compact module features integrated marine voltage spike protection to guard against system power fluctuations and current surges on onboard DC electrical networks. Operating on standard 10.8–16 VDC power with a low 20 mA draw, it streams high-quality audio using the A2DP profile up to an effective 10-meter (33 ft) range, allowing seamless control of tracks, playlists, and media playback directly from paired mobile devices across the vessel.