Iqua's BHS-603 SUN solar-powered Bluetooth headset is pretty self-explanatory - you will be able to carry out all of your conversations hands-free, with its battery offering up to 9 hours of non-stop chatting with a 200 hour standby time. Of couse, another advantage would be prolonging its in-between charge time thanks to an external solar panel which ups the juice levels by some bit each time it is exposed to the sun, working in a similar manner to the SolarVoice i908 Bluetooth headset we reviewed last month.