Humminbird XNT-9-HW-T HELIX® Dual Spectrum CHIRP Transom Mount Transducer w/TempMeet the Humminbird XNT 9 HW T HELIX Dual Spectrum CHIRP Transom Mount Transducer with Temp the dependable, high accuracy upgrade your HELIX fish finder deserves. This transom mount 2D CHIRP transducer delivers clear fish targets and detailed bottom information with a high frequency beam and a wide cone angle, plus real time water temperature data. Dual Spectrum CHIRP and Temperature at a Glance Dual Spectrum CHIRP: Full: 150 220 kHz, Narrow: 180 240