Easy to use -- You should adjust FM Transmitter and car radio, make them at the same frequency.Then let your phone or audio players connect this FM Transmitter via bluetooth/audio line.Dual USB Car Chargersr -- Quick Charging Technology with 5V/2.1A charging ports, one designed for charging and other one for reading USB filesLarger Dispaly Screen --1.44 inches Large Screen can show incoming call number, voltage level in car battery, volume, FM frequency and song name if you play music from Micro SD card or USB flash disk. Easy to read at night and in the day.Great Sound Quality -- More stable FM signal, better anti-interference performance, enhanced sound experience and built-in microphone with Echo cancellation and noise suppression (CVC) technology, offer your hands-free talking and wonderful music.Flexible And Convenient -- The flexible neck can be adjusted to the perfect viewing angle for convenient use; Memory function makes auto-connect to the last paired phone possible.