Authentic - Refurbished - Replacement Part - NOT A COMPLETE SET - You will receive a single replacement item of your choosing. One original silicon ear tip will be included.  Thoroughly tested and guaranteed to operate as intended by the manufacturer.   NO RETURNS.  FIRMWARE 1.0.5

Initialize the headset to restore factory settings.   Instructions may be found here:  https://helpguide.sony.net/mdr/wfc500/v1/en/contents/TP1000449912.html