[Easy to Use] Plug Bluetooth FM Transmitter into the car cigarette lighter; Tune the car radio into an unused FM frequency(range from 87.5 to 108 MHz), then match this FM Transmitter to the same frequency; Pair this handsfree car kits with your phone/ tablet via Bluetooth. Then you can listen your favorite songs or make phone calls. If there has an incoming call, this unit will automatically switch to telephone when you are in music playing mode. [Stable Bluetooth Connection]Want to have clear and non-intermittent phone call with your family or friend on the move? FirstE Bluetooth car adapter has fixed the issues where have noise and co-channel interference when using hands free phone call function. Now you can quickly and easily make a hands-free call directly from your cell phone without interruption. What's more, Bluetooth transmitter for car features with wide Bluetooth compatibility that work well with most Bluetooth enabled devices [Dual USB Car Charger] Wireless Audio Cell Phonoe hands free car transmitter support charging two devices at a time, which is 3.4A together. The fm transmitter with bulit-in smart chip( charging IC) will divide the voltage based on the need of device automatically. [Wide Compatibility] Bluetooth Car FM Transmitter is compatible with most Bluetooth enabled devices, such as iPhone, iPad, Tablet, Samsung, HTC, Sony and other Android smart phones; Stream music and make phone calls directly from your cell mobile devices to car stereo system speaker via FM radio signal( 87.5-108.0MHz). [Hands Free Call] In Car FM Transmitter Adapter comes with bulit-in Microphone and Noise Suppression (CVC) technology, which offers crystal clear phone calls while letting you drive more safely; Answering/ redialing/ hanging off a call/ rejecting by pressing a button.