Iqua has come out with the VizorSun, a solar speaker that can be used with any Bluetooth capable phone that supports headset or hands free usage. With a flexible UI panel and large buttons that you can find without groping, you get unlimited talk time provided your visor isn’t terribly tinted and the sun is still out. The VizorSun features answer/end/reject call, last number redial, voice dial, call waiting, mute, fast dial, and auto-reconnect. Contact Iqua for more info and price.