Humminbird XTH-6-TB-90 Bronze thru-hull transducer, 30 ft cable, tri-beam, 455 kHz/200 kHz, 5 pin connector. Recommended for boats with in-board motors that make typical transom mount transducers ineffective. Requires a hole to be drilled in the hull and the shaping of a fairing block. Used with the WIDE OPTIC, WIDE PORTRAIT, WIDE PANORAMA, WIDE PARAMOUNT, 300TX, 400TX.