TrolMaster modules and sensors come with a 16-foot (4.87 m) RJ12 cable, Y-splitter, and 4-foot (1.22 m) RJ12 cable to connect to the Hydro-X. To connect modules that are further away, you can use the extension cable kit, which comes with a 16-foot (4.87 m) cable, Y-splitter, and 4-foot (1.22 m) cable.