[Flashing LED Light Kit]: This is a DIY kit for LED flashing lights with a simple circuit, designed for circuit and soldering beginners. Every craftsman can make private customized "products" to express his most basic welding skills. [DIY electronic products] The 20-piece set has a competitive price, giving you more opportunities to complete the welding. The FR4-A PCB board with a thickness of 1.66 mm has a transparent mark, making it easier for beginners to solder and DIY. Working voltage: 3-14V. [Great School Science Project]: The electronic DIY kit is used to install simple LED lights. It is used to help students learn basic electronic welding skills. This is a great science exhibition project. It is highly recommended that you and your child practice welding skills. [Intellectual Development] You can assemble your own electronic products. It helps to expand your thoughts and imagination, and can also train children and students. In this respect, it is very valuable. [Assembly kit]: This is a welding learning assembly kit. Basic welding skills are required. Learners should refer to the circuit and component list pictures in the product list to make this kit. The FR4-A PCB board with a thickness of 1.66 mm has a transparent mark, making it easier for beginners to solder and DIY. The price of the 20-piece set is very competitive, giving you more opportunities to complete the welding. Colour:light green Material:PCB Size:2.3CM x 2.3CM Package Contents: 20 * 5mm LED flash DIY kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.