Humminbird XI-9-19 Dual Beam Ice Transducer 455-240kHzThe Humminbird XI 9 19 Dual Beam Ice Transducer is built to endure cold seasons and deliver precise sonar performance under the ice. With two beam angles and dual frequency operation, you get the flexibility to see close targets with precision and scan broader areas for structure and fishfast. Dual Beam Angles: Switch between narrow 9 and wide 19 beams to optimize returns for close targets or broad area coverage under varying under ice conditions.