Iqua LTD BHS-603 Sun Solar Powered Bluetooth Headset The 1st solar cell headset in market Charge headset in direct sunlight-no power adapter needed Darkness: up to 9 hours talk time 200 hours standby Indirect sunlight: up to 12 hours talk time or unlimited standby Compliant with Bluetooth v2.0 + EDR devices ; Includes mini USB charging cable