The tiny solar panel on this Bluetooth headset won't recharge the device as quickly as USB power, but the sun's rays can keep the headset waiting for your next call indefinitely.
While solar can't tackle most realtime energy demands, it's plenty to handle a Bluetooth headset in standby—which we must say, seems like a decent use for the tech. You'll never have to worry "is this thing that makes me look like a douchebag even working???" again.
Additionally, should you choose to purchase two headsets and actually wear them at the same time, you'll be able to appreciate A2DP (stereo Bluetooth) through multiple pairing. You know our feelings on that maneuver, so to state them yet again would be unseemly.