We have a nearly new (used once), Soundsory Headphone set. Here's the description form their site:
Discover the SOUNDSORY® headphones, a multi-sensory home based program that helps improve motor and cognitive abilities.
It comes with a carrying case, headband, USB-C cable, headphones and instructions.
Here's a link to their website: https://shop.soundforlife.com/product/soundsory-program/
There's a program you can get from them but it's not necessary.