Economical and attractive demonstration car model. Can be powered by a solar cell or a rechargeable battery (AA size, not included. Alkaline batteries are not suitable). Battery can be recharged from the solar cell, demonstrating an electricity storage system for solar power. Solar cell can be tilted to maximize the solar input. Solar cell output can be measured at two binding posts. Slide switch turns on/off and selects function. All working parts visible through clear molded housing.