Garmin GT12M Bronze Thru-Hull - 350W - 20 DegreeDesigned for midsize fishing and cruising boats, the Garmin GT12M Bronze Thru Hull is a flush mounted, 350 watt mid band CHIRP transducer that clearly defines fish arches, structure, and bottom depth on your display. Transducer Type and Power: 8 pin, 350 W bronze thru hull transducer delivering high definition mid band CHIRP sonar. Mid band CHIRP Technology: Traditional CHIRP sonar for crisp targets and reliable bottom readings. Frequency Range: Broad