Specifications: 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 Set Material: Plastic Battery: 2 x AA Batteries(Not Included) Circuit Board Size: 6.7cm x 3.5cm x 0.8cm/2.64" x 1.38" x 0.31", 9.3cm x 2cm x 1.7cm/3.66" x 0.79" x 0.67" (Approx.) Notes: 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. Package Includes: 2 x AA Battery Boxes 1 x Switch 2 x Small Lamp Holders 5 x Bulbs 6 x U Cables 1 x User Manual