Bluetooth Version: 5.0 Material: ABS Frequency: 2.4GHz-2.48GHz Connection Distance: Up to 10M Power: DC 5V 1A Size: 70*70*34.5mm Suitable for: Headphones, Speakers, Car, Mobile Phone Product Features: 1. Unique 3D Surround Sound: Immerse yourself in high-fidelity surround sound with the 3D audio button. Switch to 3D mode and let the advanced internal chip convert any audio source using convenient lossless codes. 2. Auto On: Automatically powers on when connected to power, perfect for in-car use or any application requiring automatic functionality. 3. Dual Device Link: Pair your smartphone and tablet simultaneously and stream music from either to any stereo system supporting a standard 3.5mm jack or RCA. Connect two Bluetooth devices at once to listen to music, take calls, and more. 4. Dual Connection Options: Supports simultaneous connection via 3.5mm audio port and 2 RCA audio ports. 5. Wireless Music Streaming: Stream stereo music wirelessly to your non-Bluetooth headphones and speakers. 6. Space-Saving Design: Ultra-compact and lightweight for convenient use with a variety of devices. 7. Rock-Solid Connection: Equipped with a Bluetooth 5.0 chip for stable pairing, fast transmission, and a wide signal range (33 feet). Use the 3.5mm AUX port and 2 RCA ports to connect to non-Bluetooth car audio systems, home stereos, wired headphones/speakers, amplifiers/home theaters, and enjoy wireless Hi-Fi music streaming! Note: This is a Vikefon Bluetooth receiver, not a transmitter. It cannot be used with TVs, keyboards, or mice. 8. Auto-Connect: This Bluetooth receiver automatically connects to the last paired Bluetooth device upon power-up. 9. Upgraded Key Controls: Next song/volume up, previous song/volume down, and a multi-function button (MFB) for easy control. 10. Enhanced SD Card Support: Now supports SD card playback for even more listening options. 11. Note: No built-in battery; powered by USB charging. Package Contents: 1x Bluetooth 5.1 Audio Receiver Adapter 1x 3.5mm Aux Cable 1x 3.5mm to 2RCA Cable 1x User Manual 1x Type-C Charging Cable Note: TF/SD card not included