Lantern that runs on salt and water

Japanese company Green House has demonstrated a curious device — GH-LED10WBW: LED flashlight, get electricity from a mixture of salt and water. That’s right — no batteries required. On one filling with salt water lantern capable light your way for eight hours or can work as a charger for your gadgets, thanks to an available USB port.
Lantern that runs on salt and water

The lantern comes with a special capacity to prepare the mixture and its life cycle is 120 hours, after which it will be necessary to replace the magnesium rod. In selling gadget goes in mid-September, but its value is not known yet.

According to:

Very interesting device. I am glad not the lantern, and the fact that this is possible. Only confuses «and its lifetime was 120 hours, after which it will be necessary to replace the magnesium rod»

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