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G-POWER is a device that can transform the power of gravity to electricity that could light up the LED on it. This device is extremely useful when camping outside without power source. Hanging with a heavy lord such as mountaineering bag, G-POWER can light up the whole camp while the bag falls gradually. It can last about half an hour and when the bag land on the ground we can hang it again. G-POWER can also store energy when not used.It is quite ECO, convenient and durable. Compared with Solar equipment, it is much more wide-used as G-POWER has no requirement of external environment. And it do not produce any pollution.