1.Super stable connection: Our Bluetooth audio adapter is equipped with a Bluetooth 5.0 chip for stable pairing, fast transmission and wide signal range (33 feet). | 2.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 handles conversion to make this possible with convenient lossless codes. | 3.Auto On: When you connect to power, it is very good for use in car or other areas where you want to have auto-on functions. | 4.Dual Device Link: Pair your smartphone and tablet simultaneously and stream music from both to any stereo that supports a standard 3.5mm or RCA jack. Connect two Bluetooth devices simultaneously to listen to music, make calls and more. | 5.Connect two devices: Support for simultaneous connection to a 3.5mm audio port and 2-RCA audio ports. | 6.Wireless Music Streaming: Stereo streaming of music to non-Bluetooth headphones and speakers. | 7.Space saving design: Ultra compact and lightweight for convenient use with a variety of devices. | 8.Auto-Connect: This Bluetooth receiver automatically connects to the last paired Bluetooth device the next time you turn it on. | 9.Upgrade Key Key: Increase Next Song/Volume, Decrease Previous Song/Volume, Multifunction Button (MFB). | Note: It is only a Bluetooth receiver, not a transmitter. So you couldn't use it for your TV, keyboard or mouse.