Humminbird PiranhaMAX 160 PT 4-Inch Waterproof Fishfinder and Dual-Beam Transducer Portable fishfinder with four-inch, four-level grayscale display with 160 x 128 pixel resolution Dual-beam sonar with 200/83 kHz (20 degree/60 degree) beams and 800 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+) Portable version--includes suction-mount transducer and rechargeable battery