Product Features1. Any angle adjustable、 and applicable for all types of vehicles2: Digital LED Display3: Bluetooth Hand-free4: Bluetooth stereo music play 5: Call Echo Cancellation and Noise Reduction (CVC) technology6: USB output max 5V/2A for device charging7: Support stereo sound output and FM Transmission 8: Power-off memory9: Bluetooth 3.010: Support BT running in background11: Support TF Card Music play12: Support MP3 music play 60dBDegree of distortion <0.1%Frequency response 20Hz~15KHzLeft and right channel dB >60dBBluetooth version Version 3.0Bluetooth voice With A2DP(Advance audio Distribution profile)Transmit distance 10MBluetooth microphone effective range 0.5~2MTransmit frequency 87.5-108MHzTransmit frequency modulation mode Stereo digital PLL frequency lock