3D Christmas tree DIY soldering kit is designed to improve users' electronics knowledge and soldering skills. This Christmas tree kit is very complete and comes with all the needed components, the circuit board,battery compartment, LEDs, capacitors, and transistors.It allows 36 LED flash alternately,showing a Christmas tree in the space of three-dimensional profile (the night environment has better viewing). Easy to Assemble, Exercise Hands-on Ability, The connection that was clearly mapped and labeled on the board makes it easy to assemble. The 36pcs RGB LEDs’ installation is challenging and requires patience and carefulness. It's a great DIY solder kit to excercise the hands-on ability and soldering skills for any STEM student. No programming is required. You will need a set of soldering tools(not included in the product) such as electric iron, solder wire and so on, to finish the assemble and sol DC 4.5V-5V working voltage can be powered by 3 x AA batteries or USB power adapter directly (Comes with the battery holder and USB cable). Size of the finished tree: 60x60x136mm/2.36"x2.36"x5.35" (L*W*H), weight 60(g)/0.14(lbs). Comes With USB Cable: The finished product--LED Christmas Tree will be colorful and flashing when powered with the USB cable provided. You and The varying amazing flickering lights will light up your life, If some leds don't light, please make sure all components are in right direction and correct place. Please check if there are some solder points are in poor connection, which is very important when testing. It's quite easy to make the circuit work, just insert the components in the correct places, bend them nicely and in no time a fun Christmas tree done The solder practice kit will become a beautiful flashing Xmas tree when assemble complete. 36pcs 7-color LED diodes will make a bright, colorful and wonderful light at night. Not only for practice, the tree can also be a creative gift and nice decoration, especially in Christmas. It can be used as a desk exhibition toy and also be beautiful