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.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.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.4.Connect two devices: Support to connect with 3.5mm audio port and 2 RCA audio port at the same time.5.Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers.6.Space-Saving Design: Ultra-compact and for convenient use with a 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 , 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.8.Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the time.9.Upgrade-KEY Button: song/Volume Up, Previous Song/Volume Down, Multifunction Button()10: Upgraded to support SD Card play.11.Note: No built in battery,So POWERED BY USB CHARGING.Colour:blackMaterial:plasticPackage Contents:1x Bluetooth 5.1 Audio Receiver Adapter1x 3.5mm Aux Cable1x 3.5mm to 2RCA Cable1x English User Manual1x Type C Charge CableOnly the above package content, other products are not included.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.