Here is a solar powered headset that charges continuously under sunlight to keep going longer. The Blue Tiger Solare Bluetooth 5.1 Headset has a solar cell headband. It comes with 97% noise cancellation. It has a MIL-STD-810 rating for extreme environments and temperatures from -4F to 122F.
This headset has a range of up to 200ft. It works with Google Assistant and Siri. You can find out more about it here.