Transom-Mount Transducer: Provides Single/DualBeam sonar with 455/200 kHz frequencies DualBeam Sonar: Combines two beams for great detail and a wide coverage area to help you identify fish and structure Built-In Temperature Sensor: Monitor water surface temperature on your compatible Humminbird fish finder Designed for PiranhaMAX: Compatible with PiranhaMAX 4, PiranhaMAX 4 PT, and other select PiranhaMAX models Ready to Mount: Includes a 20-foot cable and all necessary transom mounting hardware Humminbird XNT 9 28 T transom mounted tranducer has an impact release feature that pivots the transducer out of the way if struck by an object 20 foot cable and hardware are included Fits Humminbird head unit models: PiranhaMAX 176i, 195c, 175, 165