Personally I am not a fan of Bluetooth Headsets, but if you use them then here is one that might be useful, the Solar Bluetooth Headset.
The Solar Bluetooth Headset can be charged via USB or via the built in solar panel on the back, it can be placed on your dashboard in your car and will recharge via the built in solar panel.
The Solar Bluetooth Headset features built in noise reduction technology, and will work for up to 5 hours on the built in rechargeable battery.
If you want one, the Solar Bluetooth Headset is available for $66 from Brando.
via Hardware Sphere