My 4 year old daughter had these headphones for Christmas. After inserting a new battery, I test the helmet to see if it really mutes the sounds from her CD player, everything is ok. I let her helmet, and after a while I hear the music in his headphones screaming, the sound was at its maximum. In fact if you turn off and on again the headset, it does its job well, but after a minute it is not attenuated.
It is absurd to market dangerous products, it is for the children !!!
Disney Made in China low-end. I have no confidence at all.