Transom-Mount Transducer: Delivers MEGA Side Imaging, MEGA Down Imaging, and DualBeam PLUS sonar for compatible Humminbird models MEGA Imaging: Get a clear picture of what's below with sonar returns extending 125 feet out to each side of your boat DualBeam PLUS Sonar: Two sonar beams combine to offer great detail and a generous coverage area Fish Finder Compatibility: Works with XPLORE, APEX, SOLIX, and ONIX models with Side Imaging (ONIX SI series only supports 455/800 kHz frequencies available for SI and DI) Installation Ready: Includes a built-in temperature sensor and a 20-foot cable for setup