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Garmin GPSMAP551-556 Transom Mount Transducer$113.64
Operating frequency of 200 and 50 kHz. Beamwidth of 15 degrees at 200 kHz, 45 degrees at 50 kHz. Transducer kit comes with mounting hardware and installation instructions.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm.