Stable performance and high reliability. To determine if the control box is compatible with your vehicle, open the damaged electric passenger car and inspect the control box. If the appearance matches, the part should be suitable for your car. Instructions for using the remote control are clearly printed on the box. Frequency matching is required when used for the first time or after battery replacement. Step 1: Install 2 x AAA 1.5V batteries (observe correct polarity in the battery compartment), then close the battery cover. The indicator light will flash three times, indicating proper battery installation. Step 2: Press and hold the frequency key (select car) for approximately 2 seconds; the indicator light will flash. Step 3: Turn on the power of the car unit; the indicator light will turn off. Step 4: If frequency matching fails (the indicator light remains on), turn off the power and repeat steps 2 and 3. Power Supply: 2 x AAA battery (batteries not included) Part Name: Children's Electric Car Controller Model: CSR-12T-1B Voltage: 12V Size: Standard Color: As shown Material: Plastic Package Contents: 1 x Receiver 1 x Remote Control Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.