LOWRANCE HDI/CHIRP SKIMMER Wide Beam Coverage 83/200 khz and Down Imaging 455/800 khz Fishfinder Transom Mount 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. High frequency 455/800 kHz DownScan Imaging provides a life like representation of the water column, bottom, and any structure beneath your vessel. Able to measure both depth and temperature in a single package, the HDI Skimmer 455/800 simplifies installation and requires just one connection to your echosounder module or multifunction display. The HDI Skimmer 455/800 is suitable for transom or trolling motor mounting with any hull type.Frequency: 83/200/455/000 kHz.Temperature Sensor. Transom Mount.