DVD headphones?

I hope this is the right forum for this question.  I've got a 2005 Durango with DVD.  The factory provides headphones for the DVD but I didn't get them because I bought my vehicle used and they just weren't with it.  I've seen that some DVD use infrared wireless Headphones and others use 900Mhz RF.  I believe mine uses the RF type but I'd appreciate someone confirming or correcting this.  Can I buy after market headphones for it.  The factory ones are over $100 a set!  Yikes!  I've seen some good 900Mhz  wireless sets for half that price but I'm not sure if they're compatible, although I can't see why they wouldn't be.     

Most factory tv systems use IR headphones, and most all aftermarket ones will work with it.  Check to see if there are a few red lights either on the bottom of the screen, or somewhere on the unit, if so then you definately have IR headphones.

I think you might have to tell the kids if they break em they arent going to be able to watch the next movie. good way to get them to do chores too if they break them to get new ones. lol good luck99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)