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 from your smartphone. Adoption of Bluetooth 5.1 technology: Receiver for Home Stereo System is equipped with a Bluetooth 5.1 chip for high fidelity transmission of Bluetooth audio signals for music streaming to speakers or home stereo systems. Supports audio decoding: SBC, AAC, HiFi designed for audio lovers. Switch directly to pairing mode, turn on Bluetooth on your smartphone and select the device 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 play on the second phone to switch). Product: Audio connector (3.5mm) AUX Input voltage: 4.8 V, 5.25 V Continuous RX playback: 11 h (max.) Receiving distance: Indoor 10 m (max.) Material: ABS Color: 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.