This circuit is driven by a DX158 microcontroller, and there are multiple lighting control modes in the circuit. After starting up, it plays in a loop. Pressing the button can cycle to change the flashing speed. In most cases, the speed is increased by one gear per press, and when it reaches the fastest speed, pressing the button will return to the slowest gear, and so on. Note: This is DIY kit, not a finished product. You will need to solder it yourself. The products which are suitable for electronic enthusiasts to study and repair circuits. The installation of the circuit requires the buyer to have experience in the circuit. Installation precautions: All light-emitting diodes and microcontrollers have polarity components. Be careful not to install them upside down. If you need other colors or colorful effects, just replace the LED. Introduction to circuit principle: 81 LEDs constituting the Chinese knotting are connected to the single chip microcomputer through the combination of rows and columns, and are driven to light up by the single chip microcomputer program as required. The microcontroller comes with oscillation and reset, and through programming, it achieves various lighting control modes. The microcontroller program in this kit has been burned and can produce an effect after welding. DC1 is small DC socket, It can be powered by 4-5V DC, and can be powered by any 5V charging head. ( 5V charging head Not included). C1 is a filtering capacitor, which is generally not installed for stable power supply, and the kit is not provided, which does not affect the usage effect. Color: Green Material: PCB Package Contents: 1* DIY kit 1* Power cable