Features: 1. The toy will let the children be interested in physics. 2. Safe and non-toxic wood material,safe to play with. 3. Improve hands-on ability, observation, learning ability, concentration, etc. 4. Easy to mount ,full of joy,perfect educational toy. 5. All parts were well crafted for maximum quality. specification:Item Type:Physical Toy Output Voltage:1.5V Battery:2 x AA Battery(Not Included) Indication: The base and the bracket are directly inserted. If it is loose, please use latex to stick it tightly. Pay attention to the positive and negative components of the electronic components, the long leg of the lamp is positive, the buzzer "+" is positive, and vice versa. Experimental method: 1. Place the experimental rack on the table, pinch the alligator clip with your right hand and clamp the two eye-catching nails connecting the diode and the buzzer to see if the diode can be lit. Can the buzzer sneeze? 2. Clamp the alligator clip to the sheep's heel pin connected to the motor to see if the colorful disc can rotate at high speed. What color does the circle become when turning? why? PackageList:1 x Circular Wheel1 x Battery Case 3 x Screw 1 x Diode 1 x Tape 1 x Motor 1 x Buzzer 2 x Connection Cord 2 x Wire 1 x Beam 1 x Base Plate 2 x Rod 1 x User Manual