1、Hands Free Calling and Navigation Broadcast: A built in microphone for hands free calls; One simple button to answer/redial/hang up/reject calls. This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the next time.  2、Dual Device Link: Simultaneously pair your smartphone and tablet and stream music from either one with any stereo system that supports a standard 5mm or RCA jack. The bluetooth audio adapter can connect two Bluetooth devices at once to listen to music, make phone calls, and more.  3、Super Stable Connection: Our bluetooth audio adapter is fitted with a bluetooth 0 chip for steady pairing, fast transmission and a wide signal range. Wireless music streaming: stereo stream music to non bluetooth headphones and speakers.  4、Applicable and Compact Size: The bluetooth audio receiver can be connected to non bluetooth car audio systems, home stereo, wired headphone, speaker, amplifier, home theater, etc. Ultra compact and lightweight for convenient use with a variety of devices.  5、3 key: Next song/volume up, previous song/volume down, multifunction button(mfb) upgraded to support U disk play. Besides, the vikefon Bluetooth car adapter supports broadcasting voice notification from existed navigation App.