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 control box matches in appearance, the part should be suitable for your vehicle. Instructions for operating the remote control are clearly printed on the packaging. Frequency synchronization is required upon first 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, confirming correct battery installation. Step 2: Press and hold the frequency button (select car) for approximately 2 seconds until the indicator light begins to flash. Step 3: Turn on the power of the car unit; 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. Material: Plastic. Package Contents: 1 x Receiver, 1 x Remote Control. The package includes only the items listed above; other products are not included. Note: Lighting effects and display differences may cause slight variations between the item's actual color and its appearance in images. Measurement tolerance: +/- 1-3 cm.