Garmin R109LHW 2kW 38-75kHz & 150-250kHz Thru-Hull Transducer Airmar 010-12182-20. A 2 kW in a slightly smaller package this bare wire transducer has a depth of 8000 feet; an operating frequency of 38 to 75 kHz and 150 to 250 kHz; a beamwidth of 9x23...