FM Transmitter Bluetooth Receiver and Car Phone Mount with USB Car Adapter Handsfree Car Kit - Black BLUETOOTH FM TRANSMITTER EASY TO USE: Turn your car FM radio to an unoccupied FM frequency, then tune the bluetooth fm transmitter into the same frequency with the car FM radio. Support fm frequency range from 87.5MHz to 108.0MHz HIFI BLUETOOTH RECEIVER WITH USB CAR CHARGER AND USB CHARGING PORT: Bluetooth fm transmitter with a 5V/2.1A USB Charging port, please use your own apple cable to charge your apple devices if needed,and the transmitter also comes with a micro usb charging c CELL PHONE MOUNT DESIGN: Air vent car phone holder can stably hold your device, enjoy music and use your GPS app on the phone simultaneously. It will make your driving more interesting. This car radio with the latest bluetooth 4.1 technology, suitable for HANDS FREE CALLING: Built-in microphone, In the music playing mode, when there is an incoming call, fm transmitter will automatically switch to telephone mode. Press the spin button to answer/reject/redial the phone call For the connecting with the car air vents, there is a vent clip at the back of the trasmitter, you need to use the narrow gap to clamp the air vent with the general cars, not the wider side. The wide side is suitable for older pickup trucks, as well as car