Simrad HDI Med/High 455/800 9-Pin Skimmer Transducer - 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