Multi-Playing Modes. A: Via Bluetooth; B: Via Micro SD card (MP3, WMA, WAV format supported); C: Via USB flash disk; D: Via 3.5mm Audio cable (MP3 player,tablet, etc.) Dual USB Ports: The 5V/2.1A USB port is for fast charging, the other one with USB icon is for reading U disk. Support charge 2 devices at the same time. Large 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. 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. High Stereo Sound. Easily make crystal clear hands-free calls with CVC noise cancellation technology. You may need an In-car FM transmitter to stream music from your phone, tablet, MP3, MP4, TF card, even USB flash disk to the car stereo system. .Enjoy music on the go. Play Music in Multi Way With FM signal, it can play music from your Bluetooth-enabled audio devices to car stereo system. It also support play music from TF card, USB flash disk. The aux-in makes it can stream music from MP3, MP4 and other audio devices with 3.5mm port. Easy to switch between TF card, Bluetooth, USB disk mode with "M" button. Super Clear Large Screen The 1.44 inches large screen will show incoming call number, voltage level in car battery, volume and song name if you play music from TF card or USB flash disk. Charge Your Devices Easily With a 5V/2.1A USB charging port, you can charge your phone or other devices in fast speed. Easy to Use Plug it into the cigarette lighter socket, find an empty station, and match it to the transmitter. Then you can pair it with your phone for music. Specification: Bluetooth Version: V3.0 + EDR Working Current: 45mA (Max) Stand-by Current: 25mA (Max) Effective Range: 5 meters frequency range: 88-108MHz Note: Please do not play music from two sources simultaneously, or there will be two voices. If you want to change mode to play music, pause the music of the first source, and then play the music of the other source. Package Included: 1* FM Transmitter 1* 3.5mm Audio Cable 1* User Manual