Stable performance and high reliability. To determine if the control box is suitable for your vehicle, inspect the existing control box in your electric car. If the control box appears identical, the part should be compatible. Instructions for using the remote control are clearly printed on the box. Frequency matching 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, 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 (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 monitor settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.