Turn Your Car into a Streaming Machine: UGREEN Bluetooth adapter features the latest Bluetooth 5. 0 technology, the Audio receiver plugs into your car audio aux input and pairs with your favorite Bluetooth enabled device to stream your favorite music. With a built-in microphone, Our device also allows you to enjoy crystal clear sound quality on all of your calls. Note: Certificate of authorization from the Federal Communications Commission (FCC), certificate number: [2AQI5-CM279] | Double Links: The portable wireless audio adapter can connect two Bluetooth devices at the same time. And it also could compatible with most smartphones and Bluetooth electronics, pair it to your phone or tablet and enjoy CD-quality sound for all of your music or calls. | Support APTX LL: Using UGREEN aptX-LL car kit, wirelessly stream 24bit music quality for a “better-than-cd” listening experience. Standard CD quality Only is 16bit. Works with any aptx-hd Bluetooth device (E. G. Headphones, speakers) to stream audio in high definition. | Longer Battery Life: Built-in large capacity battery to provides up to 10 hours’ play and talking time/120 hours’ standby time.Besides,it comes with a micro USB charging cable to fully charge just by 1.5 hours. | Wide compatibility: The Bluetooth receiver for hifi is compatible with most Home Stereo system and can produce great sound on your old audio system. Stream music from your cell mobile devices to stereo system speaker via Bluetooth Receiver.