I've had one of these for a few days. From Sound Oasis. Model S-002. Has 24 different tracks. Useful. Glad I have it. However, only a few work for me. Surf noise from Hawaiian waves (track 14) might seem an attractive option to the easily impressed, but it's something like a resonating heavy industrial fan whine noise (not one of the 24) that gives relief from T. Doesn't look pretty in print, that latter description, does it.
Works by having a Sound Card inserted in it. There is an option to go to the manufacturer and get them to knock up a custom recorded sound card for you. But any sounds you pick must surely be on a hit or miss basis.
Long shot this. Does anyone know the technical spec for the Sound Card employed? Ideally, I would like to find a machine I could record the sounds that work for me on such an independently bought card.