Parrott Button can be programmed with the Blue Parrott smartphone app (iOS and Android) Unrivalled HD Voice call quality with 96 percent noise canceling performance Near Field Communication (NFC) for easy, instant pairing Talk for 24 hours, and charge via micro USB Use with two cell phones or a phone and PC at the same time Durable all day comfort Microphone Frequency Response:100 Hz to 10 kHz Sound Pressure Level is 123 dB plus or minus 3 dB at 1 kilowattMicrophone sensitivity: 47dBV/Pa