The first use or when replacing the battery requires frequency matching. This product is designed for specific children's riding toys. Please ensure the purchased part matches the appearance shown. Step 1: Install two AAA 1.5V batteries (not included), observing correct polarity as marked inside the battery compartment, then close the battery cover. The indicator will flash three times to confirm proper battery installation. Step 2: Press and hold the frequency key (car select) for approximately 2 seconds until the indicator flashes. Step 3: Turn on the power supply of the car; the indicator will turn off. Step 4: If frequency matching fails (indicator does not turn off), turn off the power and repeat steps 2 and 3. Type: D White Control Color: White & Blue Material: Plastic Package Contents: 1 x Children's Electric Car Remote Control Note: Only the items listed above are included. Other products are not included. 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.