Parts & Accessories Registered How to operate and connect the device to the car: Device Installation: Plug the device into the car's cigarette lighter socket (12V-24V) to power it on and illuminate the screen. Radio Wave Adjustment: Find a completely empty FM radio wave frequency on your car radio (you should only hear static, e.g., 89.0 or 108.0). Press and hold the large circular button (knob) on the device until the screen numbers start flashing. Rotate the knob left or right to set the frequency to the same empty wave number you selected on your car radio. Bluetooth Connection: Open Bluetooth on your phone and search for available devices, then select the device's name (it usually appears as FM03 or VIDVIE) and pair with it. Playing Audio: After pairing, you can play any audio file or use your phone's maps and calls, and the sound will play directly through your car speakers.