So my sister has an auditory processing disorder and I am looking for an active noise cancelling device for her. I am hoping for something that is more discreet than headphones, similar to earbuds, but without audio input abilities. Strictly noise cancelling/reduction. I found something called QuietOn (quieton.com), but the price of this is a bit steep. If anyone knows of another device like this or any input, that would be great! Thank you so much!