Garmin Airmar 509LHW 3kW 28 to 60kHz & 150 to 250kHz Thru-Hull Transducer [010-12187-20]Airmar 509LHW 3kW 28 to 60kHz & 150 to 250kHz Thru Hull Transducer This all in one transducer for popular fishing frequencies (28, 38, 50 and 200) is our best performing, highest power, 2 to 3 kW transducer. It has a depth of 10,000 feet; an operating frequency of 28 to 60 kHz and 150 to 250 kHz; a beamwidth of 5x9 to 11x23 degrees or a constant 25 degrees; and a 0 to 25 degree deadrise. This transducer has a narrow beam low frequencies for deep water