Unique 3D Surround Sound Function: With the 3D o button, switch to 3D mode to enjoy high-fidelity surround sound from a standard o source. An advanced internal chip enables seamless conversion using lossless coding technology. Auto On: Powers on automatically when connected to a power source, making it ideal for use in vehicles or other applications requiring auto-start functionality. Dual Device Link: Pair your smartphone and tablet simultaneously and stream music from either device to any stereo system with a 3.5mm or RCA input. Connect two Bluetooth devices at once for seamless music playback and hands-free calling. Dual o Output: Supports simultaneous connection via 3.5mm o port and dual RCA o ports. Wireless Music Streaming: Stream stereo o wirelessly to non-Bluetooth headphones and speakers. Space-Saving Design: Ultra-compact design for convenient use with a wide range of devices. Super Stable Connection: Equipped with Bluetooth 5.0 technology for stable pairing, fast transmission, and an extended signal range up to 33 feet. Connects to non-Bluetooth car o systems, home stereos, wired headphones/speakers, amplifiers, and home theater systems via 3.5mm AUX and dual RCA ports for wireless Hi-Fi music streaming. Note: This is a Bluetooth receiver only, not a transmitter. It cannot be used with TVs, keyboards, or mice. Auto-Connect: Automatically reconnects to the last paired Bluetooth device upon power-on. Upgrade-KEY Button: Control playback and volume with dedicated buttons for next/previous track and volume up/down, plus a multifunction button for play/pause and call management. SD Card Support: Play o files directly from a microSD card (sold separately). Power: No built-in battery; powered via USB charging. Color: Black Material: Plastic Package Contents: 1x Bluetooth 5.1 o Receiver Adapter 1x 3.5mm Aux Cable 1x 3.5mm to 2RCA Cable 1x English User Manual 1x Type-C Charging Cable Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the product image and the actual item. Measurement tolerance: +/- 1-3 cm.