Garmin's 010-11927-22 20 Degree tilt B150 Bronze Thru Hull 300W Transducer with CHIRP Technology. Provides a maximum depth reading of 750 ft. Operating frequency of 95 to 155 kHz. 26/17 degree beamwidth and mounts on a deadrise of 16 to 24 degrees. B 150M is Compatible with Garmin GPSMAP 527xs, 547xs, 721xs, 741xs, 840xs and 1040xs.