1.Unique 3D Surround Sound Function: With the 3D audio button, you can switch to 3D mode to enjoy the surround sound with High Fidelity from a normal audio source. Its advanced internal chip takes charge of the conversion to possible, using convenient lossless codes.<br> 2.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.<br> 3.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.<br> 4.Connect two devices: Support to connect with 3.5mm audio port and 2 RCA audio port at the same time.<br> 5.Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers.<br> 6.Space-Saving Design: Ultra-compact and for convenient use with a of devices.<br> 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 Bluetooth receiver only, not a transmitter. So you couldn't use it for your TV, keyboard, mouse.<br> 8.Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the time.<br> 9.Upgrade-KEY Button: song/Volume Up, Previous Song/Volume Down, Multifunction Button()<br> 10: Upgraded to support SD Card play.<br> 11.Note: No built in battery,So POWERED BY USB CHARGING.<br> Colour:black<br> Material:plastic<br> Package Contents:<br> 1x Bluetooth 5.1 Audio Receiver Adapter<br> 1x 3.5mm Aux Cable<br> 1x 3.5mm to 2RCA Cable<br> 1x English User Manual<br> 1x Type C Charge Cable<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.