Complete circuit kit2 battery boxes, 1 switch door, 5 bulbs, 6 wires, 2 circuit boards, complete circuit accessories are included for easy science projectsFun and safety It's a fun and safe physical environment. Learn how to make circuits and make circuits in various ways (series and parallel circuits) to stimulate children's curiosity.High-quality materialsMade from environmentally friendly materials, high quality and durable, very suitable for children over 4 years old to conduct experiments.Delivery without batteryBattery is not included. Two AA batteries are required. Children should use it under supervision.Electronic science toysLet children and kindergarten students learn physics knowledge and begin to form simple loops, series loops, parallel loops and cultivate hands-on skills . Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the received physical object.