Another concept marches into our lives in the form of the Q-Sound solar powered headphones. The Q-SOUND headphones would not only allow you to listen to music via any Bluetooth-enabled digital audio player, but also would let you take calls on any Bluetooth-enabled cell phone. If your player doesn't support Bluetooth there is also a 3.5mm jack to allow for a wired connection. The headband is constructed of flexible plastic incorporating amorphous silicon solar cells, while each rubber-based earpiece can be adjusted to fit differently shaped and sized heads.

Two removable NiMH rechargeable batteries, with a capacity of 800mAh and operating voltage of 1.2V, are located within the headband, just above either earpiece, which keep the headphones charged for up to 40 hours. According to Shepeleff, an hour of sunlight should provide more than 2.67 hours of running time for the headphones when operating on maximum volume.