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I get some LED light key chain as a free gift that comes together with a purchase. But it was not convenience as its need to change the battery when the light is dim. The Compact Impact Solar LED Key Chain Light keeps a long run of usage by getting energy from the sun or source of light. Meanwhile, the other side of the solar pad is a mirror and make it becomes the most wanted gadget for ladies. Lastly, no more hassle for changing battery anymore. (more picture below)

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Compact Impact Solar LED Key Chain Light
This is the smallest self powered LED light in Key Chain form. No more changing batteries! One side has solar panel another side has a convenient mirror. Available in 4 colours - blue,pink,clear,black.

Solar LED Key Chain Light | source