Our Deluxe Christmas Tree Kit features 20 red LEDs, 4 green LEDs, and 1 yellow LED that flash brightly. Operates from one 9V battery (not included) and provides a colorful and unique attention getting display. Can be hung on a tree or will stand up on its own. Size about 4 3/8” Tall x 3” (at base). This is a great kit for beginning students. Complete with all parts, PC board and instructions. Skill Level 1.