[High Quality Bluetooth 5. 0 ]Plug car bluetooth transmitter into the car cigarette lighter,tune your car radio into an blank FM frequency (range from 87. 5 to 108 MHz),then match this FM transmitter to be the same frequency,pair this hands free car kits with your phone/tablet via bluetooth. After paired successfully,if in music playing mode,it will auto switch to phone call mode if there's an incoming call. [Dual USB Port Safe Charging]Dual USB car charger can efficiently get your device quick charged,it can charge two devices at the same time and has overcharge protection,and also read U disk to play your favorite music. [Excellent Stereo Sound]Built-in microphone noise reduction technology to create full duplex sound quality offer you hands-free talking and navigation voice broadcast. Own this bluetooth car speaker,enjoy the high quality music experience in the wireless world. [Hands-free Calling] Bluetooth 5. 0 transmission technology allows fast connection and stable signal. Automatically connect memorized paired when power on. Rotate function button allows you to easily sele. Can clear and non-intermittent phone call with your family or friend on the move.