Both items are brand new $650 OBO B260 thru-hall, metal stem depth transducer The performance of Airmar’s "1 kW, 260 family" of transducers is legendary. The combination of power and sensitivity has made this the high-performing transducer of choice with conventional fishfinders. Operating at 50 and 200 kHz, the narrow, 6° beam at 200 kHz provides excellent target resolution and crisp images of fish holding tight to wrecks and reefs. The 50 kHz is excellent at deep-water detection, and its wide, 19° beam yields broad coverage under the boat. The thru-hull, B260 model has a bronze housing and is also available in stainless steel (SS260) for installation in metal hulls. Installed with the included, custom-fitting, High-performance Fairing, the B260 gives excellent results at speeds up to 30 knots (34 MPH). And Raymarine DSM300 Digital Sounder Modules provide echo sounder data that can be displayed on Raymarine E Series, C Series, and hsb2 PLUS (Pathfinder) Series display units. This handbook describes operating the DSM300 with hsb2 PLUS Series displays.