Humminbird XPT 9 20 T Portable Transducer Hydrodynamic Single or dual beam (depending on which fish finder used) 24/53 200/83kHz Built-in temperature Mounts on the transom or side of most smooth surface wood, aluminum or fiberglass boats Single- or dual-beam, utilizes 24- and 53-degree cone-angle beams with 200- and 83 kHz operating frequencies Includes temperature sensor, 15-foot cable and suction-cup mount, for trolling speeds only Compatible with many Matrix, FF and PMAX series Humminbird sonar systems Backed by manufacturer's one-year limited warranty