Here’s one from Amazon that can be pretty hardy in emmergency situations.
Walkie Talkies for Adults Rechargeable, FM/NOAA Emergency Radios with Weather Alerts, LED Flashlight & SOS Alarm, Solar Powered Hand Crank Long Range 2 Way Radios Walkie Talkie with USB Charged
Amazon.com: Walkie Talkies for Adults Rechargeable, FM/NOAA Emergency Radios with Weather Alerts, LED Flashlight & SOS Alarm, Solar Powered Hand Crank Long Range 2 Way Radios Walkie Talkie with USB Charged : Electronics
There’s a modern version – the music hat – with a built-in Bluetooth speaker.
They are still around. You can find one if you look hard enough.
It was invented in the 1930s, but the idea did not take off.
Here’s one from Amazon that can be pretty hardy in emmergency situations.
Dynamos might be an old technology, but they are very effective when everything else fails, making them perfect for emergency radio communication.