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Humminbird Chirp Ice Transducer XI 9-1521

Humminbird Chirp Ice Transducer XI 9-1521
 
Ice transducer for use with Humminbird HELIX 5 through 12 CHIRP.   This transducer operates at 130-250 kHz and covers 15 - 21 degrees on the bottom.   Is not compatible with non-CHIRP Ice products.