Before you use it, Please read the following, here are some tips for you!
1.About the volume is low:
You should first adjust the volume of the car stereo, and then adjust the FM transmitter volume. After you do them, you will solve the problem.
2.About Poor radio reception:
Do some radio Detection,listening to the radio, if there are some noise, then there must be a radio failure or a problem with the antenna.
3.About car models
It fit for the cars which Cigarette Lighters Voltage are between 12V-24V, and do not fit for 36V trunk.
4.About "Plug in the car, shaken shake will restart and Poor road conditions,Bumpy place,will start off again"
Please Firmly inserted in the end, then turn left and right a few times, Hole car cigarette lighter socket to plug the card firmly to MP3, it is recommended to clean up the cigarette lighter hole, thus reducing the problem of poor contact.
5.About " Music has noise"
Check whether the car FM stereo system's frequency matches with the FM transmitter or not -- Check your FM frequency channel is a clear channel without the interference of your local FM -- station -- Check whether the audio files are good quality compressed MP3 files or not -- Check whether the car is passing the strong frequency interference area, such as train station, -- tram station or mobile transmission station or not.

Specification:
Bluetooth Version: V3.0+EDR
FM: 87.5MHz-108.0MHz
Sensitivity: -41db+/3db 360
Voltage: 5 V + / - 0.5
Working Current: 45mA (Max)
Stand-by Current: 25mA (Max)
Frequency: 2.402 ~ 2.480 ghz
Effective Range: 5meters
Sensitivity: -92 dBm
RF Output: 4 dBm
FM: 87.5MHZ-108.0MHZ
Transmitted Power: 87dBuv/107dBuv
Effective Range: 2 Meters

What's in the box?
Bluetooth FM Transmitter*1
Audio cable*1
User Manual*1

• UNIVERSAL COMPATIBILITY: The Car Bluetooth Receiver works with smartphones Samsung iPhone, iPad, iPod, Tablet and more, compatible with bluetooth devices；Supporting AUX output and input, work with SD, TF card or MP3, MP4 players via 3.5mm audio jack. support MP3/WMA format songs in TF Card, you can store the songs and play music with them.achieve the stereo music lossless transfer to your car speaker.
• SAFETY DRIVING: With built-in microphone, you can enjoy hands-free phone calls and audio streaming music on the road. Set your hands free when answering a call and let you drive safely. Perfectly suitable for car owners.Fit for the cars which Cigarette Lighters Voltage are between 12V-24V, and do not fit for 36V trunk.
• HUMANIZED DESIGN: 1.44inch LED screen display can show current voltage of the storage battery of your car, the name of songs or caller ID, connect information, also FM channel and volume.
• SAVE YOUR TIME--- With usb car charger 5V/2.1A output, can charge your mobile phone or other device in the Way to work and the way to the meeting and the party.
• JUST ENJOY THE GOOD SOUND---High quality music, give you a good feeling when you finish your work, when you go out, when you want some encourage, when you are upset, when you need a music to relax , just enjoy it .Music, make your life full of passion.

UNIVERSAL COMPATIBILITY: The Car Bluetooth Receiver works with smartphones Samsung iPhone, iPad, iPod, Tablet and more, compatible with bluetooth devices；Supporting AUX output and input, work with SD, TF card or MP3, MP4 players via 3.5mm audio jack. support MP3/WMA format songs in TF Card, you can store the songs and play music with them.achieve the stereo music lossless transfer to your car speaker.Ann Bully