The Jabra C510 2.5 mm Cell Phone Headset features an earwave boom mic and provides clear communication with its noise reduction boom microphone. With the Jabra 2.5mm Cell Phone Headset you get more done while handling calls. The around the ear design comfortably stays in place and mic boom tip call buttons let you easily handle send / end / power functions. Use it with 2.5 mm or 3.5 mm cell phone jacks.