Romania-based designer Stephen Shepeleff has developed Bluetooth headphones called "Q-SOUND" that generate power directly from the sun. He combined solar cells with Wireless Stereo and named his creation of Q-Sound. The Q-SOUND headphones represent a type of on-ear, headband design with incorporated flexible amorphous silicon solar cells. Capacity battery should be sufficient for 40 hours of work in the music. In this one hour of charging from solar panels to provide up to 2.5 hours of operation at maximum volume levels. The Q-SOUND is a Bluetooth headset which could be used with any Bluetooth-enabled device such as digital audio player/MP3 player.