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The radiometer is educational and physical demonstration object that was invented by English physicist Crooks about 100 years ago. Today the Radiometer has become a home decoration or holiday gift.Of course, it can also be a physics teaching tool. The radiometer consists of a glass bulb with a partial vacuum.Inside are four vases which are mounted on a spindle.The vanes rotate when exposed to sunlight,artificial light or infrared radiation. The stronger the light, the faster it turns. If possible, place it on a window sill or other place with strong light. Beautiful design suitable any decoration，For example, home, office, classroom, party...Under the sunshine, the windmill keeps spinning, which can make people daydream endlessly and relax. It is made of glass by hand, and each product is a work of art. It would be a good idea to give it as a gift. It can also serve as a teaching tool to demonstrate the principles of converting light energy into kinetic energy in physics. It does not require batteries, only light. Suitable for people over 15 years old. ASIN B0DJMBJR1D Color Clear Theme Space Brand Name Yiluren Unit Count 1.0 Count Blade Shape Airfoil Manufacturer Yiluren Model Number FCS13075T Material Type Glass Number of Items 1 Additional Features Solar Powered Included Components glass bulb Manufacturer Part Number FCS13075T