Copied description from amazon: Outstanding sound for calls and music - World-class speakers and HD voice for crystal-clear calls and music Microphone frequency range 150 hertz - 6.8 kilohertz. Reduce noise and interruptions - Superior ANC and integrated busy light acts as a ‘do not disturb’ sign to enhance productivity Supported Bluetooth profiles: A2DP (v1.2), hands free (v1.6), Headset (v1.2), AGHFP (v1.6). Bluetooth wireless technology: Bluetooth 4.0. Dual Bluetooth connectivity for calls and music. Flexibility to move up to 100 feet/30 meter away from your connected device Active noise cancellation uses advanced microphones to monitor and counter ambient noise. Talk-time - Up to 15 hours. Battery time (with ANC activated) - Up to 30 hours. Charging time - Max. 120 minutes Certified with all major communication platforms. Bluetooth: 4.2 $150 or OBO Meet on or around campus.