Stable performance and high reliability. To determine if the control box is compatible with your vehicle, open the existing electric car and inspect the control box. If the appearance matches, the part is likely suitable. Instructions for remote control operation are printed on the packaging. Frequency synchronization is required upon initial use or after battery replacement: Step 1. Insert 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 proper installation. Step 2. Press and hold the frequency key (select car) for approximately 2 seconds until the indicator light flashes. Step 3. Turn on the power of the car unit; the indicator light will turn off. Step 4. If synchronization fails (light remains on), power off 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. Note: Lighting and display differences may cause slight variations in color between the image and actual item. Measurement tolerance: +/- 1-3 cm.