Adopted with CSR8615 Bluetooth Chip?? makes the transmission more stable. Double-sided gold-plated antenna?? makes the Bluetooth signal more strong.</br>Built-in HD and Sensitivity microphone?? Using ??10 SPEAKER?? High sound quality?? Noise canceling?? ideal for in-car calling??doing exercise or working.</br>Built-in 75mAh polymer battery?? ultra long life and USB rechargeable?? up to 6 hours of talking and 150 hours of standby Hands-free Call Function & Multi-point Connection?? Supports for accessory earphones.</br>Hands-free call function brings much convenient and safety when driving without hands.</br>With multi-point connect