2 USB charging ports; 1 USB Type-C connector.5 V Wat3.1 A charging process and 5 V:1A (with music symbol) charging port allow faster and more stable charging speed. | Quick and easy pairing. Plug it into the cigarette lighter; Select an empty frequency and then set the same frequency on the transmitter (87.5-108.0 MHz). | Handsfree and Stereo Sound.With built-in microphone and hands-free function, you can answer, pause, reject or re-dial calls at the touch of a button to ensure the safety of your family and family. CVC noise reduction technology makes it easy to make crystal clear hands-free calls. | Setting the FM Transmitter/Instructions- The frequency of the FM Transmitter can be changed by turning the dial with the telephone symbol. To change the frequency, the preset frequency must light up and flash (only when it flashes can it be changed by turning the wheel). | Minimize Noise- The noise when playing the music is quite normal with FM transmitters and does not represent a defective transmitter. To minimize the noise, you should set the volume of the mobile phone sound to maximum volume and then adjust the volume again via the radio.