Recent tests found noise levels from a vuvuzela, at full volume and when pressed against your ear, equates to 127 decibels.

BBC: 10 things about the vuvuzela

It appears to be the result of the abnormal volume or composition of fluid in the inner ear.

CNN: Meniere's disease

In order for all of the sensors in the inner ear to function properly, the fluid needs to retain a certain volume, pressure and chemical composition.

CNN: Meniere's disease

Both devices are about as simple as they come, and feature certain kid friendly enhancements such as dual viewfinders on the camera and volume limited headphones so kids don't get that " iPod ear" too early.

ENGADGET: Fisher-Price unveils Kid-Tough camera and music player