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 vehicle. Instructions for using the remote control are clearly printed on the packaging. Frequency synchronization is required upon initial use 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 button (select car) for approximately 2 seconds until the indicator light flashes. Step 3. Turn on the power of the vehicle. The indicator light will turn off. Step 4. If frequency synchronization 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 in picture 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.