LogiTech H390 Headset Mute Button

Did you know that the Logitech H390 Headsets have a Mute Button?

 Logitech H390 Computer Headset, Over-the-Head, Black (981-000014) | Quill.com

How to know if Logitech H390 is on mute?

When the light flashes on the mute button you know the mic is muted.