Stable performance and high reliability. To determine if the control box is compatible with your vehicle, open the electric passenger car and inspect the control box. If the control box appears identical, the part should be suitable for your vehicle. Instructions for operating the remote control are clearly printed on the device. Frequency synchronization is required when first using the remote or after replacing the batteries.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 correct battery installation. Step 2: Press and hold the frequency key (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 does not turn off), 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 up to +/- 1-3 cm.