The Humminbird Dual Helix Starter Kit allows you to link your Humminbird Helix SI fish finder unit to another Helix sonar unit (both sold separately) to get the best fish-finding capability. The networking kit has a shoot-through-hull transducer that produces accurate readings as you're cruising across the lake. (Not compatible with SOLIX or ONIX sonar units.) The Humminbird Dual Helix Starter Kit includes the transducer, 20' Ethernet cable, Ethernet adapter cables, and Side Imaging splitter cable. Manufacturer model #: IK-027830. Networks Helix SI and other sonar units together Offers more fish finding capabilities Shoot-through-hull transducer delivers accurate readings 20' Ethernet cable and adapter cables Side Imaging splitter cable