[Introducing Wireless Bluetooth to Audio] Bluetooth Receiver turns home speakers and car radios into "Bluetooth speakers" without Bluetooth functionality, allowing you to enjoy music wirelessly on your smartphone. [Adoption of Bluetooth 5.1 technology] Receiver for Home Stereo System is equipped with a Bluetooth 5.1 chip to high fidelity transmission of Bluetooth audio signals for music streaming to speakers or malfunctioning home stereo systems. [Supports audio decoding] -Adaptive/ -LL/ / -HD/ AAC/ , HiFi is designed for audio lovers. Switch directly to pairing mode, turn on Bluetooth on your smartphone and select -68 to connect. You can connect and use two devices at the same time, and you do not need to disconnect a Bluetooth connection to change playback devices. (Just pause the music on the first phone and click to play the music on the second phone to switch). Product Specifications: Audio connector (3.5mm) AUX/RCA input voltage: 4.8 V, 5.25 V Continuous RX playback: 11 h. (max.) Receiving distance: Indoor 10 m (max.) Material: abs colour: Black Package Contents: 1 x audio adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.