Usage Tips:Product Description:Experience immersive audio with our Bluetooth 5.0 Receiver featuring a unique 3D Surround Sound function. Switch to 3D mode for high-fidelity surround sound from any standard audio source. The auto-on function ensures convenience, making it perfect for use in your car or other applications.Key Features:3D Surround Sound Function: Enjoy surround sound with high fidelity using the 3D audio button for an immersive listening experience.Auto On Function: The receiver automatically powers on when connected, offering hassle-free operation.Dual Device Link: Connect your smartphone and tablet simultaneously to stream music from either device to any stereo system with a 3.5mm or RCA jack.Connectivity Options: Support for 3.5mm audio port and 2 RCA audio ports allows versatile connectivity to various devices.Wireless Music Streaming: Stream stereo music wirelessly to non-Bluetooth headphones and speakers.Space-Saving Design: Ultra-compact and lightweight, ideal for convenient use with a variety of devices.Super Stable Connection: Equipped with Bluetooth 5.0 for stable pairing, fast transmission, and a wide signal range (33 feet).Auto-Connection: Automatically reconnects to the last paired Bluetooth device upon powering on.Upgrade-KEY Button: Convenient controls for next track/volume up, previous track/volume down, and multi-function button (MFB).SD Card Play: Supports TF/SD card for additional music playback options.Powered by USB Charging: No built-in battery, powered by USB for continuous use.Package Included:1x Bluetooth 5.1 Audio Receiver Adapter1 x 3.5mm Aux Cable1x 3.5mm to 2 RCA Cable1x Manual1x Type C Charge CableNote: TF/SD Card not included