The extension cable is an optional component for the Eagle Powertrain system, designed to power the derailleur through the system's main battery instead of a separate AXS battery. The extension cable connects to the AXS battery port of the derailleur and is designed to run internally through the frame directly to the SRAM DU. The extension cable is available in various lengths to accommodate different frame sizes and designs. Additionally, the HIGO MICRO A connector variant allows for the possibility of connecting other motor suppliers. Please contact your chosen motor supplier to check compatibility.