The first use (or after replacing the battery) requires frequency matching. Press and hold the car select button until the remote indicator light starts flashing. Turn on the car; the remote indicator light will turn off, indicating a successful connection with the car. Release the button—the remote control is now ready for use. This product is designed for specific children's ride-on toys. Please ensure the purchased unit matches the original in appearance and model. Verify that other vehicle functions, such as motors and batteries, are operating correctly. Material: Plastic Requires 2 AAA batteries (not included) Dimensions: Controller 1: 150x105x50mm / 6x4.1x2 inches Controller 2: 150x100x60mm / 6x3.9x2.3 inches Controller 3: 155x52x23mm / 6.1x2.1x0.9 inches Receiver: 125x68x33mm / 4.9x2.7x1.3 inches Package Includes: As selected Note: Color may vary slightly due to monitor color calibration. Slight measurement deviations may occur due to manual measurement.