Merry Christmas! CTR-30C is a kit that can help to build little glowing Christmas tree. It can decorate your room, increase the festive atmosphere. Also you can send it to your classmates or friends as a present. At the same time,it can enhance your welding ability. CTR-30C Glowing Christmas Tree is made from three circuit boards, users can weld and assemble by themselves to make the 36 LEDs flash alternately. The Christmas tree will be showed as 3D contour and the view effect could be awesome in night. This LED Christmas Tree must be the most beautiful and outstanding landscape that will attach great attentions! The green PC board has 37 bright LEDs mounted in traditional pattern and an attached battery pack mounted on the bottom allows the tree to be self-standing or hung on your Christmas tree. Besides, this kit just runs on a standard 3X 1.5V AA battery(not included).