This product is a special Bluetooth car charger that can switch the call to the hands-free state via the professional Bluetooth module as long as the mobile phone is provided with the Bluetooth function. When the call is finished, it will be switched to the music play automatically. It can also send the music in your phone to your car sound wirelessly. You can enjoy the music and answer the call in hand-free mode without refitting your car, which ensure the driving safety while enjoying music. Features: 1. Any angle adjustable, and applicable for all types of vehicles 2: Digital LED Display 3: Bluetooth Hand-free 4: Bluetooth stereo music play 5: Call Echo Cancellation and Noise Reduction (CVC) technology 6: USB output max 5V/2A for device charging 7: Support stereo sound output and FM Transmission 8: Power-off memory 9: Bluetooth 3.0 10: Support BT running in background 11: Support TF Card Music play 12: Support MP3 music play Specification: Rated Voltage: 12V-24V Limited voltage: 10~25V USB Output: 5V 2A Work temperature: 0-50C SNR: >60dB Degree of distortion: 60dB Bluetooth Version: V3.0 Bluetooth voice: With A2DP(Advance audio Distribution profile)Function Transmit distance: 10M Bluetooth microphone effective range: 0.5~2M Transmit frequency: 87.5-108MHz Transmit frequency modulation mode: Stereo digital PLL frequency lock Dimension:125*80*25mm Weight:83g Material:ABS Color:White