Hybrid Dual Imaging (HDI) transducer (83/200/455/800) - The power of two award-winning technologies -- Broadband Sounder PLUS Exclusive DownScan Imaging. Combined to provide the best-possible view beneath your boat. The HDI Black Med/High/455/800kHz xSonic Transducer has a 9-pin connector and supports Medium and High CHIRP, plus DownScan Imaging.