I use this "silencer" for 6 years during the day, with another model I sleep at night in bed with it. I have very good ears and listen to everything. I do not want to hear when the neighbor closes a closet, closes a window, I do not want to know when the neighbor just watches TV, or outside if bank robbers rush on the road up the road. In particular, if I concentrate on the work, I want to be undisturbed by the outside, and so I can now practically no longer operate without these mufflers, when the phone rings, I'll take it from him. There is the feel disturbed by noise of their neighbors' this "silencer" many people helping, everything else is worthless. 100% protection is thus not guaranteed, it is because that sound is also transmitted through the bones in the body, not only on the ears. But 80-90% of external noise can be kept away.
