12V 2.4G Remote Control Bluetooth receiver. For initial use or after replacing the battery, frequency matching is required. This product is designed for specific children's riding toys. Please ensure the purchased part matches the appearance of the original. Step 1: Install two AAA 1.5V batteries (not included), observing correct polarity as marked inside the battery compartment. 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 begins to flash. Step 3: Turn on the power supply of the car; the indicator light will turn off. Step 4: If frequency matching fails (indicator remains on), turn off the power and repeat steps 2 and 3. Type: A: Blue Control / B: White Receiver / C: Blue Receiver / D: White Control Color: White & Blue Material: Plastic Package Contents: 1 x Children's Electric Car Remote Control / 1 x Children's Electric Car Receiver The package includes only the items listed above. Other products are not included. Note: Due to light reflection and differences in display screens, the color of the item in the image may vary slightly from the actual product. Measurement may vary by +/- 1-3 cm.