Feature:1. Applications: Customized for car modification (high speed), applicable to Children's electric toys. Buyers can know the model from the motor to ensure safe use.2. Selected Materials: The 550 drive engine uses a high strength plastic sheet combined with a motor, made of copper and steel materials, which is sturdy and durable.3. Quick Installation: It is a fast change wire connectors that install without soldering and allow quick installation or removal of the gear box!4. Specification: Working voltage of this is electric vehicle motor gear box is 12V, and the motor speed is 12000RPM, come with high working efficiency.5. Practical Accessory: A very practical replacement accessory for children's toy cars, with high matching and superior performance. Can have a better user experience.Specification:Item Type: Motor Gear BoxMaterial: Plastic, copper, steelGross Weight: 686g / 24.2ozProduct Size: 185x94mm / 7.3x3.7inRound Hole Diameter: 13mm / 0.5inMotor Model: 12V 550 12000RPMApplicable to: Children's electric toys Package List:1 x Motor Gear BoxNote:Please check that your car is working properly. (Whether the battery is damaged and whether the battery cable is connected properly.)