Gikfun 3D USB Christmas Trees 3 Colors LED DIY Kit Flash LED Circuit EK1719 It's diy kits. Need to solder by yourself. Working voltage: DC4.5-5V Finished Dimensions: 60mm length *60mm width *136mm height The flash Christmas tree kit consists of a combination of three circuit boards, the user through their own welding assembly, so that the 36 LED alternating flashing, in the space of a Christmas tree in the outline of the three-dimensional English instruction dl from links: http://pan.baidu.com/s/1gdCZbl5 The flash Christmas tree kit consists of a combination of three circuit boards, have clearly marked the electronics components, it&#039;s easy to assemble. This is a beautiful little kit that is fun to build and nice to look at when finished. 36 LED alternating flashing, in the space of a Christmas tree in the outline of the three-dimensional, really a  beautiful decoration (night environment to see better). This beautiful  3D Christmas tree is not only a decorative gift for Christmas, but also a PCB board for practicing welding skills. Working voltage: DC4.5-5V Please wear anti-static gloves or bracelet when operate electronic products. It&#039;s diy kits. Need to solder by yourself. Red Green Yellow led flash 3 kinds colors light. When four groups flash together, it looks like a small Christmas tree, must be a cute decoration and can add 
  a lively atmosphere! Finished Dimensions: 60 mm length *60 mm width *136 mm height The product is used for learning. Suit for people above 18 year&#039;s old with 1 year electronic diy experience. Or use it correctly under the guidance of electronic specializer.