Humminbird  Transom Speed Sensor  SW Part # 730021-1 

New other:is brand new all parts are there but package has been opened

Speed SensorTemperature and Speed Sensors are an optional accessory for many Humminbird fishfinders. The sensors provide quick response to changes and readout from 2 to 70 MPH for speed and from 25 degrees to 99 degrees for temperature. Description: Speed Sensor 20 ft cable transom mount. Speed range of 2-75 MPH.For Use With: Matrix 10 Matrix 10 Portable Matrix 10 Track Pack Matrix 15 Matrix 15 Plus Matrix 17 Matrix 20 Matrix 20 Portable Matrix 20 Track Pack Matrix 25 Matrix 25 Plus Matrix 27 Matrix 35 Matrix 35 Plus Matrix 37 Matrix 55 Matrix 65 Matrix 67 Matrix 97 Fishfinder 515 Fishfinder 535 Fishfinder 565 Matrix 47 3D Matrix 77C Matrix 87C FF585C FF595C 931C 937C 947C 981C 987C.Product : HUMMINBIRD SW SPEED SENSOR TRANSOM MOUNT NO TEMP Manufacturer : HUMMINBIRD PARTS Manufacturer Part No : 730021-1 UPC : 082324506895