The Humminbird XNT 9 DI T transom transducers mount on the transom of the boat in contact with the surface of the water. This transducer features a durable rubber and plastic construction and comes with a 20-foot cord. Materials: Plastic, rubber Transom Mount Transducer 75-degrees/45-degrees 455/800 kHz (DI) and 25-degrees/16-degrees 200/455 kHz, with built in temperature 20 foot cable Dimensions: 15.1 inches long x 7.3 inches wide x 8.5 inches deep For use with: 345c DI, 385ci DI, 570 DI, 596c HD DI, 597ci HD DI Combo, 788ci HD DI Combo, 858c DI, 958c DI, 1158c DI