If you are looking for an accessible AM/FM pocket radio, I just picked this one up from Amazon and am really enjoying it:
PRUNUS J-189 Bluetooth AM FM... https://www.amazon.com/dp/B07H2XHPH8?ref=ppx_pop_mob_ap_share
Not only does it do radio, but also acts as a Bluetooth speaker with really decent sound, can take microSD cards or USB flash drives full of music, and my favorite part is that you dial in your station with actual tactile buttons instead of using a scroll wheel. I regularly use mine at SAP Center in San Jose when I attend Sharks hockey games, and I just set my radio up once to 102.1 FM, and it stays on that station after turning it off and on again at the next game, so no need to constantly reset it. The radio is rechargeable and comes with a charging cable and a replaceable Li-ion battery.
The only drawback is that it uses your earbud cable as an antenna extender, so depending on the signal strength, static can start coming through the radio, but I've only ever used that in the hockey rink with the transmitter in the building. Just setting the radio up normally and tuning to a terrestrial radio station sounds just fine both with and without earbuds, so I think my static and fidelity issues just come from the low-power transmitter meant to only be heard within the building.
A radio with a USB and/or Micro SD card slot can play MP3 files and automatically repeat. It also has bluetooth. This one is cheap. I have a very similar one and it's been going without nature sounds for years now. The quality is amazingly good, too, for such a small speaker.