NSEN Replacement 20' Extension Cable Cord For Bose Headset Headphones New & High Quality Replacement Extension. Use as a spare or replacement in case your original cable is lost or damaged. Headphones or Audio Extension Cable Length:About 20' = 6M Compatible Products QuietComfort 3 QuietComfort 15 and all models of Bose on-ear, in-ear and around-ear headphones.