China's i.Tech has released a solar-powered Bluetooth headset, the SolarVoice 908. The built-in solar charger replenishes the battery while users are wearing or using the headset. On a full charge, the device is rated at five hours of talk time, while standby is rated at 140 hours. Other standout features of the handset include a noise-reduction feature and the ability to connect to two cellphones at the same time.