Q-Sound - Bluetooth Solar Headphones

Romanian Stephen Shepelev (Stephen Shepeleff) proposed an idea that was generally on the surface. Namely - to combine headphones, Bluetooh-headset and solar panel.



The resulting gadget designer called Q-Sound. According to the author’s calculations, a pair of nickel batteries of 400 mAh each is built into the headphones. If you listen to music, the charge is enough for 40 hours of work. Well, and solar batteries will recharge the main batteries. Again, according to Mr. Shepelev’s calculations, an hour of walking in the sun is equivalent to 2.5 hours of listening to music.
Like it or not, but it turned out beautiful. And the only question that I personally do not find the answer: why was it necessary to use nickel-metal hydride batteries? Type chip?
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