Item Descriptions: -Design: When you finish soldering and power on, the LED lights will spin like a wheel. And it has microphone, the kit will automatically sense the sound and let the LED lights will rotate with the sound. -Application: Ideal for elementary school science projects, science clubs, science fairs, hands-on centers etc. -Nice Gift: The soldering kit electronics is not only a PCB board for practicing welding, but also a nice gift for your child or your friend, that will be meaningful. -Material: The electronic components kit uses safety materials, effectively avoid corrosion and wear out. -Note: It is not assembled and needs you to be assembled manually. Package: Set of Electronic Project Kit Item Specifications: Size:4.8cm / 1.88inch Working voltage:5V LED quantity:10pcs LED colour:Green, blue, red, white and yellow