Feature: 1. Diversified playing method, rich functions, scientific experiments to stimulate interest. 2. Simple and safe operation, stimulate interest and improve operational ability. 3. The basic principle of series circuit is introduced to children through the experiment of lighting small bulbs. 4. Cultivate children's exploration curiosity of science, suitable for children over 2 years old. 5. When the current passes through the series circuit, there is only one passage for the current to pass through. The current passing through one lamp must pass through the other lamp, so the lamp will light up at the same time. Specification: Item Type: Circuit Learning Kit Material: Plastic Size: Approx. 8 x 10 x 5cm / 3.1 x 3.9 x 2in Suitable Age: Above 2 Years Old Users: Primary school students/small science experiment enthusiasts Battery: AA battery x 2pcs (not included) Experimental Steps: Step 1: Install the battery box on the screw plate Step 2: Connect the wires to both ends of the lamp holder, and fix them with double-sided adhesive. Step 3: Connect the wire to the switch. Step 4: Fix the switch on the screw plate, install the bulb, and complete the assembly Safety Tips: Small parts inside. Please be sure to operate safely under the guidance of teachers or adults. Beware of damage to parts due to overexertion.. Package List: 1 x Bottom Plate (Random Color)1 x Battery Box 1 x Double-Sided Adhesive 1 x Connection Cable 4 x Screw 1 x Screwdriver 1 x Bulb 1 x Base 1 x Switch