SOLAR-POWERED ENGINEThe kits includes a solar panel that powers the positive and negative cables. Children are happy to build their own STEM toys and learn energy conversion and mechanical structure principle develop creativity and practical ability during the creation. IMPROVE STEM SKILLSThis DIY kits are designed to promote your kids hand-eye coordination divergent thinking problem-solving skills inspires creativity and brain development. Manufacturered by CY-ZAM. EASY TO ASSEMBLEClear and detailed instructions make it easier to assemble at anytime helps to develop children' s practical ability. PERFECT GIFTThe best STEM toys for 12-16 year old boys and girls who love to learn about science. Its a perfect Birthday Holiday Children's day or other special day for kids teens. BUILD YOUR OWN CARPackage includes a balance car and a solar powered car for kids to build create unique STEM toys for kids & teens.