I received a pair of these for Father's day. They are sold by PSI Woodworking. They resemble the standard "Mickey Mouse" ear protectors but have a microphone and speakers inside so you can hear normal sounds but when the sound level reaches a certain decibel level the circuit shuts off and they become standard ear protectors.
This sounds good on paper, but I was disappointed. The sounds you hear are tinny and distant, bringing to mind the little button "speakers" that used to be soldered onto the motherboard of computers. I tried them while using my gas powered chipper/shredder. They would occasionally shut down, but mostly it tried to reproduce the shredder noise in it's own tinny way. I just turned the sound off, but they still did not attenuate the noise as well as my old North Gun Mufflers.
Cons: Expensive Heavier than regular mufflers Failed to shut down with loud (to me) noise. Less noise attenuation than my old El Cheapos. Faithless sound reproduction. The microphone is on the right, so conversation on the left side not picked up.
Pros: Nice looking orange and black motif.