Humminbird XNT 9 SI 180 T Transom Mount Transducer: * To operate in conjunction with a compatible Humminbird sonar or fish finder system * DualBeam plus transducer that features 20 and 74 degree cone angles operating on 200 kHz and 83 kHx frequencies * Side-imaging sonar with two 84 degree beams operating at 455 kHz * Built-in temperature sensor * 20" cable * Optional lock-down screw to override the kick up * Specifically designed for use with Humminbird"s 797c SI Combo fish finder and other side-imaging sonar systems * Material: plastic, rubber * Origin: USA