NE555 LED Christmas Tree Decoration Red and Green LED Blinking PCB Circuit Ornaments Soldering Kit with LED Lights Flashing Lights Soldering Practice Board for STEM Educational Valentine Day. This LED christmas tree decoration is a basic soldering kit designed to help in teaching the fundamentals of through-hole soldering and circuit design. It combines education and practicality, enabling users to learn while creating a beautiful decoration. The PCB circuit ornaments soldering kit displays a beautiful alternation of red and green lights. It requires 2 CR2032 batteries and can be hung not only on Christmas trees but also on backpacks, windowsills, and more, making it a great gift and a versatile decoration. This PCB soldering DIY kit is for beginners, school experiments, parent-child teaching, and friends who love handcrafts and science. It caters to a wide audience, inspiring creativity and an interest in electronics. Please note that the red and green led light does not include batteries. The christmas tree soldering kit makes for a unique and thoughtful gift, especially for those with a keen interest in electronics or DIY crafts. Operating Voltage: DC3 V DC Power Supply (1 CR2032 Button Battery). Pcb Board Size: 61 X 55 MM/2.40 X 2.16 In. Product Size: 2.4 X 2.17 Inch. Type: Module. Condition: New.