HDI SSkimmer Low/High 83/200/455/800kHz Transom Mount 9-Pin Transducer. 9-Pin Transom Mount Transducer. HDI Skimmer transducer 83/200/455/800kHz with built in temp. Includesmounting bracket and hardware. Cable Length 6M (20'). Hybrid Dual Imaging (HDI) transducer (83/200/455/800) - The power of twoaward-winning technologies - Broadband Sounder PLUS Exclusive DownScanImaging- combined to provide the best-possible view beneath your boat.