Califone has been around since 1947 serving the education market.  Anyone who has stepped foot in a K-12 school has most likely seen or used a Califone product.  Encore Products sells the ever-expanding line of Califone headphones, listening centers, media players, PA systems and more.

Right now Califone is offering an excellent back-to-school promotion:

Califone PA-IRSYS Infrared Classroom Audio Two Speaker System w/Document Camera Promo