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The temperature difference of day and light in desert is large, and this would influence a long trip. The energy ball is designed to deal with the requirement of warming and lighting in desert. It is composed with two parts: the shell used for endotherm and exotherm and the inner lamp used for lighting. The ball is tied to the camel to collect energy in daylight, because of the high temperature of sand and drawing. And it is powered to emit heat or light in many ways in night to resist the low temperature and dark.