Replacement 3.5mm Audio Earphone/Headphone Cable Cord For Sennheiser MM 450 X / MM 400 X BT Bluetooth Headphone High Quality Stereo Audio Cable/Lead Cable Length: 4 ft in length mini 3.5mm 4-din connector male to 3.5mm male 3.5mm 1/8" Audio Cable Lead AUX-In Cord w/ MIC Work For Sennheiser MM 450 X / MM 400 X BT Bluetooth Headphone