Product Features: 1.Auto OnWhen 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 broadcasting 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