Here is a newer product that makes a lot of sense for schools and families.  The Hamilton Electronics HA31 Guardian Headphone lets you know when the user has the headphone has cranked it up a little too loud.  Protect your hearing!

These are rechargeable (charger sold separately) and are available in single units or in listening centers for schools.  We offer free shipping on EVERYTHING we sell...check out our education section.

 Want to see a video review of the HA31?  Click HERE.