I have since the second set of earplugs and it can only recommend. The volume is linearly reduced and you can hear his surroundings still very good. With earplugs the sound of everything is very dull. The parts you can even entertain as they are easily weakened at about 2000 Hz for just this purpose. There are three inserts which me the white man almost always too weak, the gold and the silver is perfect almost exaggerated, more suitable for the disco.
The keychain jar I do not use the way, but know a few people who have lost so reliable the earplugs because it is unnoticed turns on itself.
