Here is a Hamilton educational headphone with a great safety feature:  The Guardian series headphone and listening center have red and green LED lights to alert you visually when a student has the volume a little too high.  This is a great way to protect the user's hearing.

The headphone is available alone or in listening centers with 4,6 or 8 headphones.  Ground shipping is free and school purchase orders are welcome!

Please call us at 866-926-1669 or view online at www.encoredataproducts.com for details. 

Part 2:  Hamilton HA-31 Guardian Headphones are a DEAL...not a dud:  Click here.