Premium Behind-The-Ear WIRED Hands-free Boom Headset MONO Headphone Single Earphone with Microphone for AT&T Nokia Lumia 520, AT&T Nokia Lumia 635, AT&T Nokia Lumia 820, AT&T Nokia Lumia 920, AT&T Nokia Lumia 925 FONUS(TM) Behind-The-Ear Mono Headset. Discreet, behind-the-ear design: provides maximum fit and comfort. Allows for hands-free conversations. Contemporary style: complements modern cell phone designs. Pivot for use in either ear. Flexible discreet, behind-the-ear design for ultimate comfort. One-touch answer/end button (if supported by your phone). Miniature clothing clip: to keep the cord in place. High-sensitivity speaker optimizes volume and enhances sound quality. Wind noise reduction: provides noise cancellation and optimal voice pick-up. - Compatible with most cell phones with 3.5mm headset port. Might ship in bulk packaging.