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Note: Transducer, XI 9 1521, 130/ 250 kHz Dual Spectrum CHIRP Frequency, 15/ 21 Degree Beam Angle, 8 Feet Cable, Dual Spectrum, Compatible With All HELIX CHIRP Units Utilizing Ice Fishing Mode, Except HELIX 12 CHIRP SI GPS, HELIX 12 CHIRP DI GPS, HELIX 12 CHIRP GPS, Not Compatible With Non-CHIRP ICE Models