Burnur electric circuit motor kit, mini dc motor education learning toys for kids DIY STEM toys science project Knowledge: Parallel circuit: A parallel circuit is one of two basic ways to make a circuit with one or more independent current paths between circuit elements that are connected in parallel. Series-parallel circuit, circuit physical picture method: first to first connection, end-to-end connection, first in and end out. The parallel circuit is such that there is more than one current between the circuit elements constituting the parallel connection. Independent paths are one of the two basic ways to form a circuit. Package includes: 1x Introduction 1 x Bulb Holder 3 x Bulbs (includes two spare bulb) 1 x AA Size Battery Holder (Battery is NOT included) 1 x Motor 1 x Buzzer Sounder 1 x Switch 4 x Wires 1 x Propeller Fan which fits the Electric Motor Warm notice: 1. Please read the pictures and Introduction carefully, use the correct circuit diagram to avoid short circuit, short circuit will produce high temperature and cause the battery Holder box to melt.This product is subject to specific safety warnings 2. The required battery is 1.5V and the size is AA (also known as LR6 size). 3. The motor kit suitable for 8+ years, children should use under the supervision of adults.