Fonus Retractable Mono Headset Headphones and In-Line Microphone Hands Free for Nokia Lumia 1520, Lumia 520, Lumia 822 Premium sound and voice quality. Allows user to talk and listen to music hands free. Retractable cable is compact and can be stored on. Excellent Bass Response. Tangle free design. In-line microphone in ABS housing. Adopted a highly conductive gold plated 3.5mm plug. Works on any device that have a 3.5mm port. This is a MONO headset with ONE Earbud only. NOTE: Please pull the retractable cords on both sides simultaneously for a better retratction.