Product Features: 1. Unique 3D surround sound function: Through the 3D audio button, you can switch to 3D mode and enjoy high-fidelity surround sound from ordinary audio sources. Its advanced internal chip takes care of the conversion, made possible by using convenient lossless code. 2. Automatically turns on when you connect to power, so it is perfect for using the function in the car or other places where you want it to turn on automatically. 3. Dual Device Link: Pair your smartphone and tablet simultaneously and stream music through any stereo system that supports standard 3.5mm or RCA jacks. Connect two Bluetooth devices simultaneously to listen to music, make phone calls, and more. 4. Connect two devices: Supports simultaneous connection of 3.5 mm audio port and 2 RCA audio ports. 5. Wireless music streaming: Stereo streaming music to non-Bluetooth headphones and speakers. 6. Space-saving design: Ultra-compact, lightweight, and easy to use with various devices. 7. Ultra-stable connection: Our Bluetooth audio adapter is equipped with Bluetooth 5.0 chip for stable pairing, fast transmission and wide signal range (33 feet). It has a 3.5mm AUX port and 2 RCA ports, which can be connected to non-Bluetooth car audio systems, home audio, wired headphones/speakers, amplifiers/home theaters, etc. Then you can enjoy wireless high-fidelity music streaming. NOTE: This is just a vikefon bluetooth receiver, not a transmitter. So you can't use it with TV, keyboard, mouse. 8. Automatic connection: This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on next time. 9. Upgrade button: Next song/volume up, previous song/volume down, multi-function button (MFB) 10: Upgraded to support SD card playback. 11. Note: There is no built-in battery, so it is charged by USB power. Package Contents 1x Bluetooth 5.1 Audio Receiver Adapter 1x 3.5mm Auxiliary Cable 1x 3.5mm to 2RCA Cable 1x User Manual Note: TF/SD card is not included