Product Features: 1.Auto On When you connect to the power, So its very good for to use in car or other you want it have auto on functions. 2.Dual Device Link: Simultaneously pair your smartphone and tablet and stream music from either one with any stereo system that supports a standard 3.5mm or RCA jack.Connect two Bluetooth devices at once to listen to music, make phone calls, and more. 3.Connect two devices: Support to connect with 3.5mm audio port and 2 RCA audio port at the same time. 4.Hands-free Calling & Navigation Broadcast: A built-in microphone for hands-free calls; One simple button to answer/redial/hang up/reject calls. Besides, the vikefon Bluetooth car adapter supports voice notification from existed navigation App, you don\\\\\\\'t need to look down the phone to ensure safe driving. 5.Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers. 6.Space-Saving Design: Ultra-compact and lightweight for convenient use with a variety of devices. 7.Super Stable Connection: Our Bluetooth audio adapter is fitted with a Bluetooth 5.0 chip for steady pairing, fast transmission and a wide signal range (33 feet). With the 3.5mm AUX port and 2 RCA port, it can be connected to non-Bluetooth car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater.etc. Then you can enjoy wireless Hi-fi music streaming! Note: It\\\\\\\'s a vikefon Bluetooth receiver only, not a transmitter. So you couldn\\\\\\\'t use it for your TV, keyboard, mouse. 8.Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the next time. 9.3-KEY: Next song/Volume Up, Previous Song/Volume Down, Multifunction Button(MFB) 10: Upgraded to support U Disk play. 11.Note: No built in battery,So POWERED BY USB CHARGING. Package Content 1x Bluetooth 5.1 Audio Receiver Adapter 1x 3.5mm Aux Cable(PS: If you not selected the "with RCA Cable",RCA Cable will not included) 1x User Manual 1x Type C Charge Cable