When children crank up the volume, they increase their risk of hearing problems.  An MP3 player turned up to the maximum volume level greatly exceeds unsafe decibel levels.  Simply telling your chilren to keep the volume low is a losing battle -- plus it's often difficult to know where safe volume levels begin and end. 

Several new headphones and earbuds from iHearSafe™ ( www.ihearsafe.com ) keep the volume at safe levels (under 85 decibels). They work with anything that has a headphone jack.   This is a really nifty product that keeps your kids' ears safe.  It also avoids constant parental nagging (which can also reach unasfe deciblel levels).