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This is a bucket designed for African residents who need to go to the river to fetch water. At the same time, when the bucket is rolling, the kinetic energy will be converted into electrical energy by the internal generator and then the energy will be stored in the battery. The electrical energy stored on the way back and forth can meet people's daily needs for electricity. Just take out the battery, and it can be applied to various small appliances in the home, such as led lights.