Furuno Stainless Steel Thru-Hull Transducer f/DFF3D Sounder. A built-in motion sensor stabilizes the display to give clear and stable images. Specifications for Furuno 165T-SS54 Stainless Steel Thru-Hull Transducer f/DFF3D Sounder: Manufacturer: Furuno Color: Silver Hull Type: Thru-Hull Features of Furuno 165T-SS54 Stainless Steel Thru-Hull Transducer f/DFF3D Sounder Stainless Steel Thru Hull with high speed fairing block Can be flush mounted in keel without using fairing block DFF3D operating frequency: 165 kHz 2 x 10M Cables: Bare ended cable for DFF3D sonar and 7-pin connector for the motion sensor Compact design Built-in motion sensor Built-in temp sensor Package Contents: Furuno 165T-SS54 Stainless Steel Thru-Hull Transducer f/DFF3D Sounder Furuno 165T-SS54: Stainless Steel Thru-Hull Transducer f/DFF3D Sounder 165T-SS54