The SRAM AXS extension cord is an optional item to the Eagle Powertrain system to power the Transmission derailleur by the main system battery instead of a separate AXS battery. The extension cord interfaces to the derailleurs AXS battery port and is designed to be internally routed through the frame directly to the SRAM DU. The extension cord is available in different length to accommodate frame sizes and design.Works with any AXS derailleurPowers derailleur by main system battery SRAM AXS Battery Cable eBike Battery Cables UPC: 710845919015 MPN: 11.3018.028.003