As with its external-mount sibling, it's a wideband CHIRP transducer, giving sharper target separation and clearer bottom/fish detail across a broad frequency range rather than a single fixed frequency, at the same 2kW/3kW power rating. Cavity-mount transducers are typically chosen for larger commercial-style or sportfishing vessels where a dedicated sonar cavity is already built into the hull design, giving excellent sonar performance without the drag or protrusion of an external through-hull fairing housing. It's designed to pair with a compatible Garmin CHIRP sonar module or chartplotter rather than working as a standalone unit. Choosing between an external-mount transducer like the R509LWH and a cavity-mount unit like this one usually comes down to what the hull itself was actually built for - a boat with an existing sonar cavity in its hull moulding will typically use the matching cavity-mount transducer, while a boat without one uses an externally-mounted, fairing-corrected unit instead.