A Salt Water Powered LED Lantern From Japan
There are plenty of battery-free flashlights out there, but they all require the muscle power of the user to light up. They might be a life saver, but we all know that these mechanically powered flashlights are close to no good.
However, a true battery-free alternative does exist. This salt water powered LED lantern by Green House is really just powered by 350cc of salt water. Every solution powers up this eco-friendly gadget for up to 8 hours, during which you can benefit of 55 lumens of illumination thanks to 10 LED lights or charge any USB device.