1. solar helicopter's propeller is made of solar panels. 2. Material:Wood 3. colors: red, yellow, green, blue,nature Feature:1. propeller is made of solar panels, can whirl under the direct sunshine 2. the material is wood3. It is apply to education, which will be helpful for the children's creavity and innovation!4. charge in the sunshine for a few hours, it will work without electircity.5. it ...