Item Type: DIY 3D Christmas Tree Kit_x000D_ Optional Colors: 7 Colors, 3 Colors_x000D_ Working Voltage: 4.5~5V_x000D_ Power Supply: Dry Battery, USB 1The circuit is simple and practical, with low power consumption. 2Integrated circuit drive, fewer parts, simple wiring. 3With pluggable plug, it is convenient to replace parts at any time, which is beneficial to circuit debugging. It also allows us to deepen the understanding of circuit principle during debugging. 4The circuit consists of 16 LEDs (Light Emitting Diodes). 5The 16 LED lights are divided into 4 groups, each with a different blinking frequency. When the 4 groups of lights are flashing at the same time, the project looks like a small Christmas tree.1 Pack of Lamp Beads1 Pack of Circuit Accessories3 x PCB Board1 x Battery Holder1 x USB Wiring