Humminbird XI-9-1521 Dual Spectrum Ice Transducer [710273-1]XI 9 1521 Dual Spectrum Ice Transducer Ice Transducer, Dual Spectrum CHIRP, 15 21 Degree, 130 250 kHz. No temperature 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. Cable Length: 8 Feet Not compatible with non CHIRP ICE models. 1 Year Limited Warranty *Not compatible with non CHIRP Ice products. WARNING: This product can expose you to chemicals including