Solar Powered Radio Headset. $34.95. I believe the radio will only play Sunny Bono tracks, but I’ll get back to you on that.

‘They’ve built this nice radio that solar recharges a small Ni-Mh AAA battery that’s included and it will operate on solar alone in just 30% of full sunlight. Any additional power goes to keep the battery topped off. One hour of sunlight is 1-2 hours of radio play.
The AAA battery will let you play the radio for 18 hours on a full charge.’