Welcome to the store! 1. Card Size: 8.8 x 5.7cm/3.46 x 2.24 inches 2. Card Thickness: 1.6mm 3. Card Material: International standard plate, all tin plating, high-strength fireproof material, can be repeatedly disassembled. 4. The PCB board design is reasonable, widely used in SMD components. 5. The left and right sides of the three components are used for practicing welding, each column with a test point. 6. The middle circular circuit is for the water lamp circuit, using CD4017, NE555, LEDs; welding power can make it work. 7. The circuit is also used on the back, with a ruler to facilitate component measurement. There are examples of PCB conductors to facilitate the use of PCB design. 8. Circuit Voltage 3 ~ 12V 8. This kit includes all the elements shown in the following photos. Number of Components: 125 Number of Solder Joints: 274 Solder Length Used: 35CM (diameter: 0.6mm) Sample Soldering Time: 35 minutes No retail package Package includes: 1 pcx SMD Blinking LED Components Soldering Practice Board Electronic Circuit Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!