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If you're a multitasker who's always on the go, you can't risk your handsfree headset running out of power. Enter the IQUA 603 Sun, the first solar-powered Bluetooth headset, which soaks up all available light through a photovoltaic cell. The little green gadget then charges itself, indefinitely extending the operating time of this extremely lightweight headset. Considering that it's compatible with just about any Bluetooth phone, it's a steal at just over $100.