It might only be useful for contacting your fair weather friends but it will certainly save you on batteries.  The Scosche solCHAT II is a solar powered Bluetooth speakerphone, specifically designed for hands free conversation while driving there are plenty of applications for a Bluetooth speaker with a DSP microphone.  If you can think of a use, be it driving or otherwise, check out Futurelooks for an in depth look.

“I had the opportunity to try out the first Scosche solCHAT solar-powered Bluetooth speakerphone a while ago and was generally pleased with what it had to offer. The second-generation Scosche solCHAT II (CBHSOL2) takes on the exact same form factor, but it comes with a few minor upgrades worth noting.”

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