Description This circuit is composed of 16 pcs LED (light emitting diode). The 16pcs LED divided into four groups, and each group has different flashing frequencies, when four groups flash together, this item looks like a small Christmas tree. The circuit is powered by a 9V battery. This circuit is simple and practical, low power consumption.It uses integrated circuits for driving: fewer parts,and the line is simple and easy to understand. With pluggable designed for easy replacement of parts at any time and conducive circuit debugging. Also allows you to deepen understanding of the principles of the circuit in the debugging process. for CTR-30 flash Christmas tree kit consists of three circuit board, allows 36 LED flash alternately, showing a Christmas tree in the space of three-dimensional profile (the night environment has better viewing). The kit will make your Christmas more memorable and fantastic. Specifications: Color: show as pictures. Operating voltage: DC4.5-5V Power supply: 3 AA batteries or USB charger (The adapter does not includes) for Dimensions: 60 x 136 x 60mm (L x W x H) Instruction download: Click to open Notes: There might be a bit color distortions due to different computer resolutions. Because of the manual measurement, there will be a bit of error here. Please understanding, thank you! Packing List: 1 x Christmas Tree LED Flash Kit.