Humminbird PiranhaMAX 170 4-Inch Waterproof Fishfinder and Dual-Beam Transducer (Discontinued by Manufacturer) Fishfinder with four-inch, eight-level grayscale display with 240 x 160 pixel resolution Dual-beam sonar with 200/83 kHz (20 degree/60 degree) beams and 1600 watts PTP power output Fish ID+ interprets sonar returns and displays Fish Symbol when requirements are met Programmable fish and depth alarms (fish alarm works together with Fish ID+) Transom-mount transducer included; one-year warranty