Compatible with your smartphones, tablets or MP3 players through Bluetooth;
Answer/hang up calls hands-free while driving and listen to your favorite music inside the comfort of your car; 
Adjust random the angle, suitable for different vehicles, and CVC technology cancel echo and reduce ambient noise;
Enjoy hands-free calls, music playing, USB charging, FM transmitter, automatically power-off memory and more functions;
Built-in chargeable lithium battery, you can charge your devices on the go via the USB port;
Full frequency range from 87.5 to 108Mhz, can satisfy your need and preference for different frequency channels.

Specification:

Rated Voltage:12V 
Limited Voltage:9-26V 
USB Output:5V/2.1A 
Work Temperature:0-50 
Supports File Format: MP3/WMA/WAV 
SNR:>60dB 
Degree of Distortion:<0.1% 
Frequency Response:20Hz-15KHz 
Left and Right Channel: dB>60dB 
Bluetooth Version:2.0 
Bluetooth Feature:A2DP(Advance Audio Distribution Profile) 
Bluetooth Transmit Distance: Up to 30 feet (to get the best audio quality, we recommend to use the Bluetooth transmitter within 20 feet.) 
Bluetooth Microphone Effective Range: 0.5-2M 
FM Transmit Frequency:87.5-108Mhz 
Transmit Frequency Modulation Mode: Stereo digital PLL frequency lock 

Package include: 

1 x Bluetooth FM Modulator 
1 x User Manual