Professional headset for greater productivity and amazing sound for calls and music. Busy light automatically turns on during a call to let others know the person is busy. Users can also activate it manually to signal that they don’t want to be disturbed. Simply wear the headset to eliminate high-frequency noise, such as human voices - all thanks to the specially designed ear cushions. We call this “passive noise cancellation.” The 3.5 mm jack lets you connect to your personal device - such as a smartphone or tablet - to work or listen to music wherever you are.