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. 1 x Bluetooth Audio Receiver 2 x Wiring1 x Charging Line1 x User Manual Item Type: Bluetooth Audio ReceiverMaterial: PlasticOutput Interface: 3.5mm Stereo RCA Left and Right ChannelsFunction Description: U Disk, Hands Free Call,NFC ConnectionBluetooth Protocol: AVRCP, A2DPFrequency Range: 2400- 2483.5KHZFrequency Response: 20HZ-20KHZOutput Power: 28mW RL=16ΩSNR: 》90dBTotal Harmonic Distortion: 《 0.1%Support SBC and AACForward Transmission Distance: 10m/ 32.8ftSupport Micro USB Interface 5V Power Supply