User Tips:
1.It is a normal phenomenon that FM product will have some noise because of the interference of the local radio signal.Find a vacant or non-interfered frequency and sync Onever device to that frequency for minimized static noise.
2.To achieve best audio quality,please set the volume on your phone or the device to maximum and then adjust the volume for your car stereo;you are not suggested to adjust volume of your car speaker to maximum (this will bring lot noise).
3.Suggest that RAM less than 32GB.  larger than 32GB which may cause the abnormal reading.
4.Our products support the use of 12-24V normal battery in the car/truck,we recommend that you do not use the product in car/truck that modified the battery.This may cause burned because of instantaneous high current.
5.To protect this device,we recommend to remove it from cigarette outlet after use,to avoid instant high start voltage damage the device.
6.If you want to charge the phone and listen to the car radio at the same time, please note that your radio frequency and our device's  frequency do not get too close.
7.Press and hold the middle button for 5 seconds to switch between Chinese and English.
Feature:
1.100% brand new and high quality.
2. Built-in Bluetooth 4.2+ Microphone, supporting hands-free calls. Safer and more convenient.
3.Dual USB outputs 5V/3.4A, suitable for charging iPhone, iPad, iPod and other devices.
4.Noise cancellation function, built-in noise cancellation circuit, make the call sound clearer
5.LED display the number.
6.Battery Voltage,Automatically detect car battery voltage, voice reminder, support instant voltage viewing.
Specifications:
1. Working voltage: 12V-24V
2.USB output voltage: DC/5V
3. Dual USB 5V3.4A (Max) in Total
4. Bluetooth version: Bluetooth 4.2
5. Effective distance: 0-10M
6. Launch distance: 0-5M
7. Support TF card / U disk capacity: ≤ 32GB
8. Voltage detection range: 6-30V
9. Power mode: cigarette lighter power supply
10. File Support Type: WMA,APE,FLAC,WAV
11.FM frequency range: 87.5-108MHz
15. Product size: 7.1cm*3.6cm
Package Contents:
1x FM transmitter 1x User Manual