1. Auto On When you connect to the power, So good for to use in car or other you it have auto on functions. Dual Device Link: Simultaneously pair your smartphone and tablet and music from either one with any stereo system that supports a standard 3.5mm or RCA .Connect two Bluetooth devices at to listen to music, make phone calls, and more. 2. Hands-free Calling & Navigation Broadcast: A built-in microphone for hands-free calls; One simple button to /redial/hang up/reject calls. Besides, the Bluetooth car adapter supports broadcasting voice notification from existed navigation App, you 't need to look down the phone to safe driving. 3. Wireless Music Streaming: Stereo music to non-Bluetooth headphones and speakers. Space-Saving : Ultra- and lightweight for convenient use with a of devices. 4. Super Stable Connection: 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 , home stereo, wired headphone/speaker, Amplifier/Home Theater.etc. Then you can enjoy wireless Hi-fi music streaming 5.Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the time. 3-KEY: song/Volume Up, Previous Song/Volume Down, Multifunction Button(). Upgraded to support U Disk play. Content: AUDIO Sound : Double Model Number: NEW bluetooth receiver Transmission Distance: 10m / 33ft Charging: Type c Port 5V colour:Black Material:ABS size:78 x 50 x 18mm Package Contents: 1 x Bluetooth 5.0 Audio Receiver Adapter 1 x 3.5mm Aux Cable 1 x RCA cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.