Hybrid Dual Imaging (HDI) transducer (83/200/455/800) The strength of two award-winning technologies -- Broadband Sounder PLUS Exclusive DownScan Imaging -- merged to deliver the finest possible view under your boat. The HDI Black Med/High/455/800kHz xSonic Transducer features a 9-pin connector and supports Medium and High CHIRP, along with DownScan Imaging