Powerful Hybrid Dual Imaging (HDI) and space-saving size make this Lowrance Elite 4x HDI Sonar a convenient and highly effective fish-finding tool. HDI combines a Broadband Sounder sonar that uses highly sensitive digital filtering so you see the fish around you and DownScan Imaging™ that produces brilliant images of what is beneath you. DownScan Overlay™ technology overlays DownScan Imaging and Broadband Sounder for the most complete sonar readouts. Brilliant, high-resolution, 4.3", LED-backlit color display shows brilliant sonar images. TrackBack™ allows you to review sonar history so no fish-producing details are missed. Multi-Window Display lets you choose from pre-set split-screen layouts including a three-panel view. Advanced Signal Processing produces optimal results without the need to constantly adjust settings manually.