This headset produces good sound, just as histoque "PortaPro". The two helmets have the same headphones, the difference is in the frame.
The product is described as possessing a function "Mute" but I have not found and the package does not mention this feature. Is it simply unplug the mini jack to mute? ;)
In short, it is an inexpensive headset for the richness of the sound it makes!