BLUETOOTH ADDS MANY CONVENIENCES TO DRIVING. With a Bluetooth receiver, you pair your phone to the receiver and stream audio to it. The receiver then plugs into the 3.5mm input jack (auxiliary in) found near the center controls or inside the center console. If your car or radio doesn't have an auxiliary input, you'll be better off with an FM transmitter. So  you can keep your hands on the wheel and your focus straight ahead! Hands-free devices help reduce dangerous driving distraction. This Bluetooth car adapter kits that connect to your audio system are convenient, require little installation, and increase safety for you and your passengers.WAYS TO ADD A BLUETOOTH RECEIVER TO YOUR CAR 1. AUX-in If your car has an AUX port, simply plug the bluetooth receiver into your car's AUX port, your stereo 3.5mm AUX input. Bluetooth picks up the audio signal sent from your phone and pair your smart phone to the Bluetooth receiver. The wireless signal is decompressed and converted to an analog signal. Your stereo then amplifies the signal it receives. 2. No Aux Port(Connect via FM Transmitter) FM transmitters are really only recommended for those who do not have AUX inputs in their vehicles. FM transmitters send audio to a radio frequency.  Just connect your smart phone to the FM transmitter via Bluetooth, then tune your car's stereo to the same frequency as the FM transmitter. Product Details: Bluetooth version: V5.0+EDR Play mode: FM or AUX F M launch: 87.5/95.0/108.0 Product size: 50X50X10mm Cable length: 3.3ft Power supply: 5V/ 0.5a ~ 2.1a Effective distance: <10 m Compatibility: all cars are available Package included 1*Bluetooth Receiver 1*Magnetic Base 1*User Manual