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World-class speakers and HD voice for crystal-clear calls and music. You can switch on active noise-cancellation to virtually eliminate low-frequency sounds, such as the hum of air conditioning. Active noise-cancellation uses advanced microphones to monitor and counter ambient noise. Superior ANC and integrated busy light act as a ‘do not dis turb sign to enhance productivity. Dual Bluetooth connectivity to two devices at the same time for calls and music. Flexibility to move up to 100ft/30m away from your connected device. Don’t miss important announcements or questions from your colleagues. Press the left ear cup to hear the outside world without having to take off your headset Red lights on both ear cups are activated automatically when on a call or manually activated by the user when busy, to act as a ‘do not disturb signal.02- year warranty