Logitech H540 has a fatal design flaw
The Logitech H540 will fail (short out) at the red mute indicator LED mounted inline on the USB cable. First it looks as if you might have not muted the microphone because you will find the red LED is off. Then you might notice that red LED starts to flicker.
Looks nice until you touch it
Stereo sound quality is reasonable
Design flaw in the SUPER STIFF cable with mounted mute indicator LED will cause the headset to short out the USB connection and eventually the internal connection at the mute LED will fail causing the H540 to stop functioning.