It can form a simple series circuit and parallel circuit.Let the children know exactly how the bulb is light up and get basic circuit knowledge.In the process of hands-on experiment, stimulate the desire to learning.Item Name: Circuit Experiment Equipment SetMaterial: PlasticBattery: 2 x AA Batteries(Not Included)Circuit Board Size: 6.7cm x 3.5cm x 0.8cm or 2.64" x 1.38" x 0.31", 9.3cm x 2cm x 1.7cm or 3.66" x 0.79" x 0.67" (Approx.)Notes:Due to the light and screen setting difference, the itemand 39 s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:2 x AA Battery Boxes1 x Switch2 x Small Lamp Holders5 x Bulbs6 x U Cables1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.