Watch the Noise from that Nano

MP3 players and other personal listening devices - such as your tween's new iPod Nano - can pose a real danger to hearing, experts warn. Luckily, it's not difficult to determine whether your child has the volume level too high.

"If others have to raise their voices to be understood by the child, the music is too loud," says Barbara McLay, who oversees a hearing conservation program at the University of Missouri-Columbia. Likewise, if you can hear what your child is listening to through her headphones, the music is too loud.

MP3 players can easily exceed volume levels of 100 decibels, which can damage hearing in less than two hours, hearing experts say. That means that the message most kids need to hear is, "Turn it down."

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