In 2010, Shure introduced new SE series earphones. A key feature on each model is a replaceable cable that has sub-miniature MMCX connectors: a female connector on each earphone and two male connectors on cable.
The model CBL-M+-K is a 56 inch (142 cm) replacement cable that includes a three-button remote switch and a microphone.
The earphones then serve a dual purpose: to listen to music or to listen to the person on the other end of the call.
The microphone is used to speak to the other person during a call.
The CBL cable is manufactured solely based on specifications provided by Apple.