This plastic transom mount can be used to replace the dual frequency transducers included with many Garmin units.The 500 W 8-pin transducer has a maximum depth of 1,500 ft; an operating frequency of 50 to 200 kHz; a beamwidth of 40 to 10 degrees; and mounts on a 0 to 70 degree transom.Transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging your boat.When using with a 6-pin Garmin sounder, transducer adapter cable part number 010-11612-00 is required.The 6-pin transducer is preferred.