Circuit board: thickness 1.5mm, length 64mm, width 26mm Power supply voltage: 4-12V DC, higher voltage results in brighter LED output This kit uses sound to control 10 LEDs in a flowing water effect, clearly demonstrating the function of the CD4017 chip. It is designed for learning about counters, frequency dividers, and color light control. The kit provides an engaging and practical experience Notice: Identify the positive and negative terminals of the microphone (the pin with three wires at the bottom connected to the shell is the negative terminal) When soldering, start with smaller components and then proceed to larger ones Color: As shown Material: Plastic + metal Package Contents: 10 x Voice Activated LED Water Light Kit CD4017 Note: The package includes only the items listed above; other products are not included Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3 cm