what does the phone icon do on the switch?

People use these types of head sets for their phone system, usually an office, or dispatch. The phone button is just a quicker way to pick up, or hang up, a line. I mainly use mine to talk to internet space ships, and have never needed to use that function.

Questions & Answers: Logitech H570E Stereo Headset (981-000574)

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Logitech H570E Stereo Headset (981-000574)

Durable and adjustable padded headband can be worn comfortably all day while metal reinforcement provides strength, flexibility, and "just the right" fit
With acoustic echo cancellation and a noise-cancelling microphone, H570e is optimized so you can hear and be heard, even in noisy workspaces
Control the call with answer / end, volume up / down and mute buttons. A flat and flexible cable resists tangles
A dynamic equalizer automatically switches between voice and music modes, delivering the best sound quality for what the user is listening to
Logitech Sound Protection protects against sounds above 115 dBA to deliver exceptional listening comfort for voice and music (compliant with EN60950-1)

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