Where can I get a radio that is suitable for someone with dementia and vision problems?

I have alexa and I just tell it to play acoustic blues (or whatever) for 45 minutes.
I can also schedule music to be played automatically for certain times when Mom's awake.
My mom cannot work the radio, or any electronics.
I tried the one button radio and she wouldn't use it.

That's a tough question to answer. With dementia, she cannot learn how to operate a device for herself. Perhaps the caregiver can play the music. One with a sleep timer is best to save batteries/power.

There’s a one button radio available. You preset the station and the volume. All your loved one has to do is push the button.

https://www.maxiaids.com/one-button-radio?gclid=CjwKCAjwhuCKBhADEiwA1HegOSgmgXNenoPOvJCuDxSBHhkcM76lkQh46fHMyScPuaL96w6LMCI2PxoC86MQAvD_BwE

Get an Amazon Echo Silver.

Here's a music player that's easy to use.
Just download songs from Amazon or iTunes onto this player. And they can listen anytime.

https://www.amazon.com/iGuerburn-Upgraded-Dementia-Products-Alzheimers/dp/B08D3LJQG2/ref=mp_s_a_1_3?dchild=1&keywords=mp3+for+seniors+with+dementia&qid=1633133960&sr=8-3

I think that would be hard because with Dementia they forget how to use phones and remotes probably will not be able to learn how to use a radio. The only thing I could suggest was an Alexa or something like that.