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The main material of Nail's body is stainless steel. The internal sponge absorb the moisture in the soil. The water battery locates the inside of sponge. When the water battery contacts the water through the wet sponge, it produced electricity to make the LED shine. The heat of LED vaporizes the repellent. Higher temperature made the repellent to speed up to evaporate; it would let the bugs and mosquito leave around the tent. The shining Nails made around of the tent to keep shining and enhance the comfortable of camping.
Hsiang-Wei , Chen