The Humminbird XTH 9 20 Bronze Thru-Hull Transducer is for large boats, and boats with in-board motors that make most typical transducers ineffective. This bronze thru-hull transducer is not recommended for trailered boats, and Humminbird recommends you have it professionally installed due to the fact that it requires a hole be drilled in the hull and the shaping of a fairing block. The XTH 9 20 is for single-, or dual-beam use with 20-, and 60-degree beam angles and operating frequencies of 200 kHz and 83 kHz.

Thru-hull transducer, works with thinner hulls, while internal, steel sleeve provides extra reinforcement Dual-beam transducer with 20-, and 74-degree beam angles and operating frequencies of 200 kHz and 50 kHz Not recommended for trailered boats, and professional installation recommended Compatible with, and designed for Humminbird 931C DF and 937C DF sonar systems Includes fairing block, and is backed by manufacturer's one-year limited warranty

Mounts on to the body of most trolling motors, with a low-profile, drag-reducing shape Hydrodynamic, dual-beam transducer, with a built-in temperature sensor 20-degree and 60-degree cone angle beams, with 200 kHz and 83 kHz operating frequencies Compatible with many Matrix and FF series Humminbird sonar systems Backed by manufacturer's one-year limited warranty.

The Humminbird XTM 9 DB 74 T Trolling Motor Mounted Transducer is designed to mount onto the body of most trolling motors, and is constructed with a low-profile shape that reduces drag in the water and minimizes the chance of hang-ups on weeds. This unit is a single and/or dual-beam trolling-motor transducer with 20-degree and 74-degree cone angle beams, with 200 kHz and 50 kHz operating frequencies respectively. The XTM 9 DB 74 T has a built-in temperature sensor, and is compatible with Humminbird's 931C DF and 937C DF sonar systems. This item is backed by Humminbird's one-year limited warranty.

Trolling motor mount transducers are designed to mount onto the body of most trolling motors. A low-profile shape reduces drag in the water and minimizes hang-ups on weeds. 15 ft cable and hardware included. This model will work with 997c SI

Mounts on to the body of most trolling motors, with a low-profile, drag-reducing shape Includes 15-foot cable and connecting hardware Wide-side, 3-element allows it to look left, right or down, not recommended for high speed Compatible with many Wide and TX series Humminbird sonar systems.