Feature: 1. Full frequency FM transmitter. 2. Supports digital display. 3. Support USB disk TF card player4. Support U disk player/ MP3/ WMA format music. 5. One USB output voltage, the power supply to other devices, the maximum output of 5V/ 1A. 6. Automatic power-off memory function. 7. Bluetooth answer, hang up, reject, redial calls and other functions. 8. Bluetooth stereo music play. 9. Display of on-board battery voltage. Connection to Bluetooth Devices: (1)Turn the car kit on. (2)With the LED indicator `s 1 time/second blinking, search for the bluetooth devices names X5 on your smartphone or other devices(3)Enter the password (4)The devices has memory function. it will automatically connect to its memories paired Bluetooth Devices when power on. Package Included: 1 X Car FM Transmitter Car Charger 1 X User Manual.