Features:<br />Not only your kids will know something about electric components, but also understand the principle of parallel circuits.<br />This toy DIY kit is good for stimulating children&#39;s learning interest and developing their thirst for knowledge. <br />Help to cultivate children&#39;s curiosity about science, and to improve their ability of innovation and practice of their own.<br />Selected top-quality metal components to achieve the best and stable performance.<br />Made of good quality wood planks and plastics, safe to use and environmental friendly.<br />Designed for children aged 7 and up, this mini Traffic Lights Model is very easy to assemble.<br/>Specifications:<br />Material: Wood&#43;plastic<br />Power Supply: 2 * AA battery (NOT included)<br />Item Weight: 120g / 4.23oz<br/>Package List:<br />1 * Package of DIY Kit